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When a force acts on a body of mass $10 kg$ for, $2 s$ then the velocity of the body increases from $5 m / s$ to $8 m / s$ . What will be the momentum of the body before the force acts on the body?

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40 kgm / s

52 kgm / s

50 kgm / s

32 kgm / s

answer is C.

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Detailed Solution

When a force acts on a body of mass

10 kg

for

2 s

then the velocity of the body increases from

5 m / s

8 m / s

. The momentum of the body before the force acts on the body is

50 kgm / s

.
we know that momentum is given by the product of mass and velocity of the body,

P = MV

So, the momentum of the body before the force acts will be,

P = mu

where

Initial velocity, u = 5 m / s

Mass of the body, m = 10 kg

P = 10 \times 5

\Rightarrow P = 50 kgm / s

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