A boy of mass 60 kg running at 3 m/s jumps on to a trolley of mass 140 kg moving with a velocity of 1.5 m/s in the same direction. What is their common velocity?
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Hey mate ☺️ ❤️
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 it will be helpful to you
Thanks ☺️❤️✌️
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