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A heavy mass M resting on the ground is ...

A heavy mass M resting on the ground is connected to a lighter mass m through a light inextensible string passing over an ideal pulley. The string connected to mass M is loose. Let lighter mass m be allowed to fall freely through a height h such that the string becomes taut. If t is the time from this instant onward when the heavier mass again makes contact with the ground and `Delta E` is change in kinetic energy then

A

`t=(2m)/(M+m)sqrt((2h)/(g))`

B

`t=(2m)/(M-m)sqrt((2h)/(g))`

C

`Delta E = - ((M m)/(m+m))gh`

D

`Delta E =- Mgh`

Text Solution

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The correct Answer is:
B, C
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