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Q2. If a body of mass 2kg. is at restand is hit by a mass of 4kg. moving with 3m/s, find fraction of the momentumretained by the moving body assuming the collision to be elastic and head-on.Ans1. If n = m2/m1

2. How much work done on a body of mass 1 kg whirling on a circular path of radius 5m.

3. State potential energy and its SI unit also derive it.

4 State Power and SI unit.