A boy of mass 50 kg running at 5m/s jumps on to a 20 kg trolley travelling in the se direction at 1.5 m/s. What is their common velocity? Please write the answer with complete explanation.

A boy of mass 50 kg running at 5m/s jumps on to a 20 kg trolley travel

1.	A boy of mass 50 kg running at 5m/s jumps on to a 20 kg trolley travelling in the se direction at 1.5 m/s. What is their common velocity? Please write the answer with complete explanation.
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A boy of mass 50 kg running at 5m/s jumps on to a 20 kg trolley travelling in the se direction at 1.5 m/s. What is their common velocity? Please write the answer with complete explanation.​

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A boy of mass 50 kg running at 5m/s jumps on to a 20 kg trolley travelling in the se direction at 1.5 m/s. What is their common velocity? Please write the answer with complete explanation.