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Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 2 - Force and Laws of Motion

Question 78 Exercise

A car of mass 2400 kg moving with a velocity of 20 m/s is stopped in 10 seconds on applying brakes. Calculate the retardation and the retarding force.

Answer:

Mass of the car = 2400 kg

Initial velocity, u = 20 m/s

Final velocity, v = 0 m/s

Time, t = 10s

Retardation, a = (v-u)/t = 2 \mathrm{m/ s^2}

Force = ma = 4800N

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