Question

- A boy of mass 50 kg running 5 m/s jumps on to a 20 kg trolltravellingin the same direction at
1.5 m/s. Find their common velocity,​

Answer 1

Explanation:

Hey mate you have to use the law of conservation of momentum

m1u1 + m2u2 = m1v1+ m2v2

where

m1 = mass of boy

m2 = mass of trolley

u1 = 5m/s

u2 = 1.5m/s

after the boy jump on cart the total mass will be = 70kg

and common velocity will be v

solve by keeping the values

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