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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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9000 N

12000 N

6000 N

3000 N

answer is B.

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Detailed Solution

Momentum = mass x velocity.

$P = 1500 \times 20 = 30000$

From newton's second law $F = \frac{P}{t} = \frac{30000}{5} = 6000 N$

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