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Question

Explain the second law of motion.

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Solution

The second law of motion states that the rate of change of momentum of a body is directly proportional to the net external force applied and this change in momentum is in the direction of force applied.

$F o r c e = R a t e o f c h a n g e o f m o m e n t u m = \frac{C h a n g e i n m o m e n t u m}{C h a n g e i n t i m e}$
$\Rightarrow F = \frac{m v - m u}{t}$

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