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Question

# A trolley containing water has a total mass 1000 kg. Now water starts coming out of the trolley at the rate of 10 kg/s from below it. Find the velocity of the trolley after 50 s, if the initial speed is 10 m/s on the horizontal frictionless road.

A
10 m/s
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B
20 m/s
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C
15 m/s
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D
None
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Solution

## The correct option is A 10 m/sThe velocity of system will not change in horizontal direction as water is leaking out vertically down. Because leaking water does not exchange any momentum with the trolley in horizontal direction.

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