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Q.

The expression for external force in terms of momentum

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a

F = \frac{P_{2} - P_{1}}{t}

b

F = \frac{P_{1} - P_{2}}{t}

c

F = \frac{P_{2} + P_{1}}{t}

d

F = \frac{P_{1} P_{1}}{t}

answer is A.

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Detailed Solution

The expression for external force in terms of momentum

F = \frac{Δ P}{Δ t} = \frac{P_{2} - P_{1}}{t}

.

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