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
8m
b
16m
c
24m
d
32m
answer is D.
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Detailed Solution
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.