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Question

Find the average frictional force needed to stop a car weighing 500 kg at a distance of 25 m if the initial speed is 72 km/h.

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Solution

Given:Mass of the car, m=500 kgDistance covered by the car, s=25 mInitial speed of the car, u=72 km/h=20 m/sFinal speed of the car, ν=0 m/s
Retardation of the car,
a=ν2-u22s a=-40050=-8 m/s2Frictional force, F=ma=500×8=4000 N

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