Question

A car is moving in a straight line with speed 18 kilometre per hour it is stopped in 5 seconds by applying the brakes find the speed of car in metre per second and the retardation and the speed of the car after 2 seconds of applying the brakes

Answer 1

18×5/18=5m/s
u=5m/s
v=0m/s
t=2s
a=v-u/t
=0-5/2
=-2.5m/s
d=s×t
=5×5=
25m
s=d/t
=25/2
=12.5