A force of 25 N acts on a body at rest for 0.2s and a force of 70 N acts for the next 0.1s in opposite direction. If the final velocity of the body is 5ms

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A force of 25 N acts on a body at rest for 0.2s and a force of 70 N acts for the next 0.1s in opposite direction. If the final velocity of the body is 5ms^–1, the mass of the body is

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0.8 kg

0.4 kg

1 kg

2 kg

answer is D.

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Detailed Solution

The total impulse on the body will be $J = 25 \times 0.2 - 70 \times 0.1 = - 2$

So the magnitude of final momentum is 2

$m (5) = 2 \Rightarrow m = 0.4 kg$

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