First slide
Concept of potential energy
Question

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

Easy
Solution

The change in gravitational potential energy =work done by gravity
=Mgdisplacement in the direction of mg
=MgR
=MgR
ΔU=MgR
Therefore, the correct answer is  C
 

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