A trolley of mass 300 ks carrying a sand bag of 25 kg is moving uniformly with a speed of `27km//h` on a frictionless track. After a while, sand starts leaking out of a hole on the trolley's floor at the rate of `0.05kgs^(-1)`. What is the speed of the trolley after the entire sand bag is empty ?

Options

A. `27 km h^(-1)`
B. `54 km h^(-1)`
C. `108 km h^(-1)`
D. `135 km h^(-1)`

Answer

A

Explanation

As the trolley carrying the sand bag is moving uniformly therefore , external force on the system is 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 trolly shall not change