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Conservation of Momentum

A trolley con...

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/s
The 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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