**Q.No.3.8: - Find the change in momentum for an object subjected, to a given force for a given time and state lawof motion in terms of momentum.**

**Ans: -**Consider a body of mass “m” moving with an initial velocity

**v**. Let us suppose that an external force

_{i}**F**acts upon it for time “t” after which velocity becomes

**v**. If this force produces an acceleration

_{f}**a**, then it is expressed as,

This is Newton ’s 2

^{nd}law in terms of momentum.
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