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Q.

A trolley of mass 300kg carrying a sandbag of 25kg is moving uniformly with a speed of 27kmph on a frictionless track. After a while sand starts leaking out of a hole on the floor of the trolley at the rate of 0.5kgs–1. What is the speed of the trolley after the entire sand bag is empty?

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a

27 kmph

b

10.09 kmph

c

13.5 kmph

d

29 kmph

answer is D.

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Detailed Solution

From LCM,

m1u+m2u=m1v1+m2v2
⇒(300+25)27=0+300v2

⇒v2=29.2 kmph

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