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Physics · WORK, ENERGY AND POWER
हिन्दीA trolley of mass \( 300\text{ kg} \) carrying a sandbag of mass \( 25\text{ kg} \) moves uniformly at a speed of \( 27\text{ km h}^{-1} \) on a frictionless track. Sand leaks out vertically through a hole in the bottom of the trolley at a constant rate of \( 0.05\text{ kg s}^{-1} \). What is the speed of the trolley after the sandbag is completely empty?
Correct answer · Option 1
\( 27.00\text{ km h}^{-1} \)
Explanation
The leaking sand leaves the trolley vertically relative to the trolley, carrying away the same horizontal velocity as the trolley. No net horizontal external force acts on the system, so the velocity of the trolley remains unchanged at \( 27\text{ km h}^{-1} \).
