Question

A car was moving with a velocity of 90 km/h. the driver applies brake and the car comes to rest after traveling  400m. What is the acceleration of the car and the time taken by the car to come to rest?​

Answer 1

Answer:

u=126 km/h=126×

18

5

m/s=35m/s

v=0

s=200m

Newton's Equation of motion

v

2

−u

2

=2as

0

2

−35

2

=2a(200)

a=−3.0625m/s

2

Also

v=u+at

0=35−3.06t

t=11.4s