NCERT Exercise 5.19 - Work, Energy and Power
Question: A 300 kg trolley carrying a 25 kg sandbag moves at 27 km/h on a frictionless track; sand leaks vertically through a floor hole. Find final trolley speed.
Answer: Final speed = **27 km h^-1 (7.5 m s^-1)**.
Full step-by-step NCERT solution with diagrams on Something by Zero.