NEET Physics Work-Energy Theorem MCQ Question
Consider a scenario where 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. Sand starts leaking out of a hole on the floor of the trolley at the rate of 0.05 kg/s. What will be the speed of the trolley when the sandbag is empty?
The speed increases because mass decreases.
The speed remains the same because the track is frictionless.
The speed decreases because mass decreases.
The speed becomes zero because the sand leaks out.
Correct Answer
Detailed Explanation
Since the track is frictionless and there are no external forces acting horizontally, the speed remains constant as per the Work-Energy Theorem.
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