Question

A boy having mass 60 kg running left to right at speed 6m/s catch a ball of mass 150g coming from right to left at speed 12m/safter taking catch. Calculate the average speed of boy with the ball in his hand.

Answer 1

This question is based on conservation of momentum...

initial momentum= final momentum..

common velocity means both trolley and boy moves with same velocity..

now..

initial momentum=60×3+140×1.5

=180 + 210

=390 kgm/s

final momentum=(60+140)V

200V

so on equating..

200V=390

V=390/200=1.95m/s

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