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September 18, 2019

Solution to problems – class 9 – Set 1 Q 54


Problem Statement

54) A boy of mass 50 kg running at 5 m/s jumps on to a 20 kg trolley travelling in the same direction at 1.5 m/s. What is their common velocity?

Solution

Initial total momentum= (50 x 5 + 20 x 1.5 ) kg m/s = 280 kg m/s

Final combined mass = (50+20) kg = 70 kg


Let the final velocity of the combined system = V

According to the conservation of linear momentum:

70 V = 280
V = 280/70 = 4 m/s



Question Set – Physics Problems for grade 9

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