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Q.

A car travelling at a speed of 30 km/hr is brought to a halt in 8 m by applying brakes. If the same car is travelling at 60 km/hr it can be brought to a halt with the same braking force in:

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a

32m

b

8m

c

16m

d

24m

answer is D.

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Detailed Solution

detailed_solution_thumbnail

Stopping distance is proportional to square of the vehicle's speed s=u22a.

Hence for same car moving at different speed s'=su'u2=8×60302 m =32 m.

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