Question

A car mass 1330 kg is traveling at 28 m/s. The driver applies the brakes to bring the car to rest over a distance of 79 meters. What is the retarding force acting on the car?

Answer 1

`"-6596.8 N"`

Explanation:

`v^2 - u^2 = 2aS`

From above equation find retardation

`a = (v^2 - u^2)/(2S) = (("0 m/s")^2 - ("28 m/s")^2)/(2 × "79 m") = -"4.96 m/s"^2`

Retardation Force `= ma = "1330 kg" × "-4.96 m/s"^2 = -"6596.8 N"`