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Q.

A car of mass m, travelling at speed v, stops in time t when maximum braking force is applied. Assuming the braking force is same for both cases. What time would be required to sop a car of mass 2 m travelling at speed v?

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a

12t

b

t

c

2t

d

2 t

answer is D.

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Detailed Solution

Let the acceleration of first car be a. Then acceleration of second car is.For first car, 0 = v-at                    or t = vaFor second car, 0 = v-a2t' or t' = 2va = 2t
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