Question

A motor cyclist travelling at 12m/s decelerates at 3m/s^2.
(a)How long does he take to come to rest?
(b)How far does he travel in coming to rest?

Answer 1

a. vf=vi+at
0=12-3t solve for t in seconds
b. distance= avgvelocity*time=6m/s*time

Answer 2

9m/s