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Q.

A car of mass 1500 kg is moving with 20 ms-1 velocity. If the breaks are applied it comes to rest in 5 seconds, then the retarding force is

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a

9000 N

b

12000 N

c

6000 N

d

3000 N

answer is B.

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Detailed Solution

Momentum = mass x velocity.

P=1500×20=30000

From newton's second law F=Pt=300005=6000 N

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