Question

A boy of 50kg hops with a horizontal velocity of 5m/s on stationary skateboard. The skateboard weights 4 kg . Find the velocity when the board starts rolling.

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Answer 1

Answer:

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The skateboard starts rolling at the speed of 4.62 m/s.

Mass of the boy = 50 kg

Intial velocity of the boy = 5 m/s

Weight of the skateboard = 4 kg

Intial velocity of skateboard (the skateboard is stationery) = 0 m/s

According to Law of conservation of momentum:

(50 × 5) + (4 × 0) = v(50 + 4)

⟶ 250 + 0 = 54v

⟶ 250 = 54v

⟶ v = 250/54

⟶ v = 4.62 m/s

Therefore, the skateboard starts rolling at the speed of 4.62 m/s.

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