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A car having a mass of 1 metric ton is moving with a speed of 30 m/s. It suddenly applies the brakes and skids to rest in a certain distance d. The frictional force between the tyres and road is 6000 N. What is the value of d?(a) 25 m(b) 50 m(c) 75 m(d) 100 mThis question was addressed to me in exam.Query is from Work-Energy Theorem for a Variable Force in chapter Work, Energy and Power of Physics – Class 11

Answer» RIGHT option is (c) 75 m

Easiest EXPLANATION: Let; m = 1000 kg

From Work-Energy theorem

Kf – Ki = F * d

0 – (1/2 * m * v^2) = -6000 * d

1/2 x 1000 x 30^2 = 6000 x d

d = 75 m.


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