Question

A car accelerated from 45 m/s to 0 m/s in 10 seconds. what is the average acceleration of the car?

Answer 1

Answer : The average acceleration of the car is
`-4.5m/s^2`.

Solution : Given,

Initial velocity = 45 m/s

Final velocity = 0 m/s

Time = 10 seconds

Average acceleration : It is defined as the change in velocity divided by the time.

Formula used :

`a=(\Delta V)/(t)=(V_(final)-V_(initial))/(t)`

where,

a = average acceleration

t = time

`V_(initial)` = initial velocity

`V_(final)` = initial velocity

Now put all the given values in this formula, we get the average acceleration.

`a=((0m/s)-(45m/s))/(10s)=-4.5m/s^2`

Acceleration is in negative that means the speed of car is slowing down.

Therefore, the average acceleration of the car is
`-4.5m/s^2`.

Answer 2

constant acceleration is defined as time rate change of velocity.