Question

Keiko is riding a skateboard 2 m/s, west. How long will it take her to reach a velocity of 8 m/s, west if her acceleration is 2 m/s2?



3 seconds
6 seconds
8 seconds
10 seconds

Answer 1

acceleration of 2m/s^2 means that every second the speed increases by 2m/s.

So, to change from 2m/s to 8m/s, it increases 6m/s

That takes 3 seconds

Answer 2

3 seconds