A trolley of mass 300 g carrying a sandbag of 25 kg is moving unifomly 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 ?

Explanation

As the trolley carrying the sane bag is moving uniformly, therefore, external force pm the system = zero
When the sand leaks out, it does not lead to the application of any external force on the trolley. Hence the speed of the trolley shall not change