When a body starts from rest or it changes it direction of motion,it is called as initial velocity. We generally consider initial velocity is equal to zero(u=0),only when the object starts from rest. Generally at time (t=0),the initial velocity is zero.

Also, What is the symbol for initial velocity?

The symbol v0 [vee nought] is called the initial velocity or the velocity a time t = 0. It is often thought of as the “first velocity” but this is a rather naive way to describe it.

Hereof, Why is initial velocity not zero?

If you choose to start looking when something is already moving, that object will have an initial velocity that is not zero. For projectiles, as Arturo mentioned, we tend to start looking at an object after it has been launched, and already attained some speed, so it has a non-zero initial velocity.

Also to know What is initial velocity in free fall? An object in free fall experiences an acceleration of -9.8 m/s/s. … If an object is merely dropped (as opposed to being thrown) from an elevated height, then the initial velocity of the object is 0 m/s. If an object is projected upwards in a perfectly vertical direction, then it will slow down as it rises upward.

Is final velocity zero?

If an object is already in motion and it deaccelerates and stops then is final velocity is said to zero. Final velocity is denoted by ‘v’. When a moving body comes to a halt.

18 Related Questions Answers Found

Is V initial or final velocity?

It is represented by letter u. Three initial velocity formulas based on equations of motion are given below, If time, acceleration and velocity are known. The initial velocity is formulated as.

Formulas for Initial Velocity.

u Initial velocity
Final Velocity
t time taken
s displacement
a acceleration

What are the 5 equations of motion?

In circumstances of constant acceleration, these simpler equations of motion are usually referred to as the “SUVAT” equations, arising from the definitions of kinematic quantities: displacement (S), initial velocity (u), final velocity (v), acceleration (a), and time (t).

What is the formula for velocity and acceleration?

Key Equations

Displacement Δx=xf−xi
Average velocity –v=v0+v2
Velocity from acceleration

Position from velocity and acceleration x=x0+v0t+12at2(constanta)
Velocity from distance v2=v20+2a(x−x0)(constanta)

Is final velocity greater than initial velocity?

For ideal conditions, initial velocity equals final velocity if, but only if, initial and final elevations (Y) are equal. In fact during flight, the velocity on the way up at a given elevation (Yn) is the same as the velocity on the way down at that same elevation (Yn).

At what time is the velocity equal to zero?

Average speed is the total distance traveled divided by the elapsed time. If you go for a walk, leaving and returning to your home, your average speed is a positive number. Since Average velocity = Displacement/Elapsed time, your average velocity is zero.

What is the formula for free fall acceleration?

An object in free fall will still have a weight, governed by the equation W = mg , where W is the object’s weight, m is the object’s mass, and g is the acceleration due to gravity.

What is the formula of free fall?

Free fall means that an object is falling freely with no forces acting upon it except gravity, a defined constant, g = -9.8 m/s2. The distance the object falls, or height, h, is 1/2 gravity x the square of the time falling. Velocity is defined as gravity x time.

What is the formula for time in free fall?

Imagine an object body is falling freely for time t seconds, with final velocity v, from a height h, due to gravity g. It will follow the following equations of motion as:

h= frac{1}{2}gt^2


v²= 2gh


The formula for free fall:


Height traveled
t Time taken

How do you find velocity with only height?

Height and Velocity Functions

Ascertain the height from which the object fell. Multiply the height by 2, and divide the result by the object’s acceleration due to gravity. If the object fell from 5 m, the equation would look like this: (2*5 m)/(9.8 m/s^2) =1.02 s^2.

How do you find velocity in free fall?

As a consequence, gravity will accelerate a falling object so its velocity increases 9.81 m/s or 32 ft/s for every second it experiences free fall. Velocity (v) can be calculated via v = gt, where g represents the acceleration due to gravity and t represents time in free fall.

What is the free fall formula?

An object in free fall will still have a weight, governed by the equation W = mg , where W is the object’s weight, m is the object’s mass, and g is the acceleration due to gravity.

What is difference between initial and final?

Initial velocity is the velocity at time=t1, where t1 is the beginning of the time intervalof interest, typically chosen as zero. Finalvelocity is the velocity at time=t2, where t2 isthe end of the time interval of interest.

What is the symbol of initial velocity and final velocity?

And the symbol v stands for the velocity of the object; a subscript of i after the v (as in vi) indicates that the velocity value is the initial velocity value and a subscript of f (as in vf) indicates that the velocity value is the final velocity value.

How do you find velocity given time?

Velocity is defined as the speed of an object in a given direction. In many common situations, to find velocity, we use the equation v = s/t, where v equals velocity, s equals the total displacement from the object’s starting position, and t equals the time elapsed.

What is the SI unit of velocity?

Velocity is a physical vector quantity; both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called speed, being a coherent derived unit whose quantity is measured in the SI (metric system) as metres per second (m/s or m⋅s1).

What is difference between speed and velocity?

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object’s movement. Put another way, speed is a scalar value, while velocity is a vector. … In its simplest form, average velocity is calculated by dividing change in position (Δr) by change in time (Δt).

What is the final velocity?

Initial and Final Velocity

Initial velocity describes how fast an object travels when gravity first applies force on the object. On the other hand, the final velocity is a vector quantity that measures the speed and direction of a moving body after it has reached its maximum acceleration.

How do you find velocity in physics?

Velocity (v) is a vector quantity that measures displacement (or change in position, Δs) over the change in time (Δt), represented by the equation v = Δs/Δt. Speed (or rate, r) is a scalar quantity that measures the distance traveled (d) over the change in time (Δt), represented by the equation r = d/Δt.

Can you find velocity without time?

A common question asks students to calculate the final velocity of an object without knowing how long it accelerated. As long as the acceleration and displacement of the object is known, any student can solve this problem.

Can velocity be negative?

An object which moves in the negative direction has a negative velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a positive acceleration).