a girl of mass 20kg with speed of 6 m/s jumps on a 10kg trolley travelling in the same direction at 2m/s. find their common velocity
options:
A) 1.2 m/s
B) 3.4 m/s
C) 5.2 m/s
D) 8.2 M/s
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Answer:
4 m/s none of these I think
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