Question

A motorcycle starts from rest with constant acceleration of 1.5m/s^2 until it achieves velocity of 15m/s. The motorcycle decelerate until it stop 12s. Determine:
1) the deceleration of motorcycle
2) distance traveled by the motorcycle

Answer 1

question one does not make sense to me.

2) figure time it takes for the first portion
vf=vi+at solve for time, vf=15, vi=0

distanceFirst=avgvelocity*time=7.5*time
distance Second=avgvelocity*12
and avg velocity for each phase again is 15/2 m/s