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Abhishek Jhunjhunwala

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2 years ago
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How much momentum will a dumb-bell of mass 10 kg transfer to the floor if it falls from a height of 80 cm? Take its downward acceleration to be 10 ms–2,

1 Answer
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Muskan Anand

2 years ago

Mass of dumb-bell = 10 kg       Height, h = 80 cm = 0.8 m       a = 10 m/s2       u = 0       v2 – u2 = 2 as       v2 – (0)2 = 2 × 10 × 0.8       v2 = 16       v = 4 m/s       Momentum p = mv             = 10 × 4             = 40 kgm/s

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