Question

A car is driving with a velocity of 108km/h suddenly a child crosses the road 100m in frond of the car. the driver applies brakes and comes to a stop in 5 second. Calculate the acceleration of the car

Answer 1

Vo = 108,000m/3600s = 30 m/s.

V = Vo + a*t = 0, a = -Vo/t = -30/5 = -6.0 m/s^2.

Answer 2

Does the car stop before hitting the child?

Answer 3

Yes

Answer 4

20.8km/s
Yes