Question

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 floor of the trolley at the rate of 0.05 kg s^–1. What is the speed of the trolley after the entire sand bag is empty?

Answer 1

As the trolley carrying the sandbag is moving at a uniform speed, there are no external forces acting on the system. The leakage of sand from the trolley does not introduce any external forces. Therefore, the speed of the trolley will remain unchanged.