Question

A moving car decelerates for 5.0s and comes to a complete stop. It travels 75m in the process.
a) determine its initial speed
b)determine its rate of deceleration

Answer 1

a=-am/s^2 v (final speed)=0m/s s(Distance)=75m t=5 seconds
use (v+u/2)*t=s
plug in the givens
(u/2)*5=5
solve for u
b) rate of deceleration=change in velocity/change in time=v-u/t2-t1=0-u/5