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  4. A body of mass 5 kg is acted on by a force F which varies with time t as shown in the given figure. Then the momentum gained by the body at the end of 10 seconds is

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Q. A body of mass 5 kg is acted on by a force F which varies with time $t$ as shown in the given figure. Then the momentum gained by the body at the end of 10 seconds isPhysics Question Image

JIPMERJIPMER 2010Laws of Motion

Solution:

Change in momentum = force $\times$ time
= area of trapezium $OABC$
$= \frac{1}{2} (10 + 4) \times 20 = 14 kg \, m \, s^{-1}$