Question

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. what is the car's acceleration in meters per second per second?
a. 4

b. 1

c. 2

d. 5

e. 3

Answer 1

Acceleration = change in velocity divided by time taken...

I.e Acceleration = (Final velocity - Initial Velocity) /time taken...

The question says the body accelerate from rest... Therefore it's initial velocity = 0

It reach a speed(velocity) of 20m/s.. My final velocity

And the time taken to attain the velocity = 5 seconds....

Therefore

acceleration = (20-0)/5

a = 20/5

a = 4ms¯²

Hope this helped....