Question

A car is traveling at 15 m/s. It goes down a hill where it accelerates at 3 m/s2 for 4 s. How fast is it going at the bottom of the hill?

Answer 1

Initial speed = 15m/s.

Change in speed = + 3m/s X 4s = 12m/s

Hence final speed at hill bottom = 15+12 = 27m/s