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A constant force F is applied on a troll...

A constant force F is applied on a trolley of initial mass `m_0` kept over a smooth surface. Sand is poured gently over the trolley at a constant rate of `(mu)`kg//s`. Afer time t, find

(a) mass of the trolley (with sand)
(b) net force on the trolley
(c) velocity of trolley

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