Question

a force of 7 Newton acts on a object for 3 seconds what will be its final momentum if its initial Momentum was 10 kg metre per second
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Answer 1

$F=dP/dT\\F=P_{final}-P_{initial}/dT\\7=P_{final}-P_{initial}/3\\21=P_{final}-P_{initial}\\21=P_{final}-10\\31kgm/s=P_{final}$

Here is the ans