Question

A car moving with a speed of 35 m/s sees a child standing in the

middle of the road. The driver of the car applies brakes and brings the
car to rest in 5 sec, just in time to save the child. Calculate the average
stopping force of the vehicle, if the mass of vehicle and the driver is
300 kg.

Answer 1

2100 N

Step-by-step explanation:

`v = u + at \\ 0 = 35 + a(5) \\ a = - 7m {s}^( - 2) \\ \\ net \: force \: = ma \\ = (300)(7) \\ = 2100 \: newtons`