A trolley of mass 300 kg carrying a sandbag of 25 kg is moving uniformly with a speed of 27 km/h on a frictionless track. After a while, sand starts leaking out of a hole on the trolley's floor at the rate of 0.05 kg m/s. What is the speed of the trolley after the entire sand bag is empty?
Sand leaks from the trolley with the same velocity which the trolley has initially.
Therefore, there is no change in momentum of sand and hence, the trolley.
Therefore, after the entire bag is emptied, the velocity of the trooley remains the same, i.e., 27 km/hr.
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