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Question

A motorcar is moving with a velocity of 108 km/h and it takes 4 s to stop after the brakes are applied. Calculate the average force exerted by the brakes on the motorcar if it's mass along with the passengers is 1000 kg.

A
4500 N
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B
5500 N
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C
7500 N
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D
2500 N
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Solution

The correct option is C 7500 N
Average force,

F=ΔpΔt=pfpiΔt=m(vfvi)Δt

F=1000(0108×5/18)4=7500 N

Negative sign shows that brake force acts opposite to the initial velocity.

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