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Question

82kg male and 48kg female skate together at 7.4m/s, male pushes female for a wall with 8.6m/s Find the speed of male?

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Solution

Using the law of conservation of momentum :

Initial momentum = Final momentum or

m1u1+m2u2=m1v1+m2v2

82×7.4+48×7.4=48×8.6+82×v

(82+48)7.4=48×8.6+82×v
(130)7.4=48×8.6+82v
v=6.69m/s.

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