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Question

A body of mass, m, resting on a smooth inclined plane at an angleΘto the horizontal is
connected to a mass M over a smooth pulley (Figure 4). Find the velocity, v of the object
of mass m when it has moved a distance b up the plane.

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A
v=2gb(MmsinΘ)M+m
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B
v=gb(M+msinΘ)M+m
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C
v=2gb(MmsinΘ)Mm
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D
v=gb(MmsinΘ)Mm
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Solution

The correct option is A v=2gb(MmsinΘ)M+m
Decrease in PE of system =MgbmgbsinΘ
Increase in KE of system =12(M+m)v2

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