A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's average acceleration?

1 Answer
Feb 21, 2016

a_{avg}=6ms^-2

Explanation:

We'll use a simple kinematic equation to solve this.
v=v_o+at

Here, given that v=42ms^-1, s=7s and that it started from rest so v_o=0ms^-1, we get
42=0+a*7=cancel{42}^6/cancel{7}^1=a

So, that's how we got acceleration.