Question

A car starts from rest and accelerates uniformly to reach a speed of 21 m/s in 7.0 s. What was the speed of the object after 2.0 seconds?

Answer 1

6 m/s

Step-by-step explanation:

Well we can find acceleration a=v/t = (21-0)/7=3 m/s^2

vf=at+v0, use this equation to solve for the vf

vf=3(2)+0=6 m/s was its speed at 2s