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Q.

Figure shows a body of mass M sliding from rest down a frictionless fixed track of radius R in time t. Assume that the body started from the top of the track A and slides to the bottom B. The change in the magnitude of gravitational potential energy is

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a

MgR2

b

MgR

c

MgR

d

MRt

answer is C.

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Detailed Solution

The change in gravitational potential energy =−work done by gravity=−Mgdisplacement in the direction of mg=−MgR=−MgR∴ΔU=MgRTherefore, the correct answer is  C
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Figure shows a body of mass M sliding from rest down a frictionless fixed track of radius R in time t. Assume that the body started from the top of the track A and slides to the bottom B. The change in the magnitude of gravitational potential energy is