Question

A boy of mass 60kg running at 3m/s jump on a trolly of mass 140kg moving with velocity of 1.5 m/s in the same direction what is their comman velocity

Answer 1

Hello! Your answer is attached. Hope it helps.

Answer 2

Answer:

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

Hope this helps