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Questions  

The potential energy for a body of mass m that is acted on by a very massive body is given by U=-mgx+kx33.    The corresponding force is

a
-mg+kx2
b
mg-kx2
c
mg-kx
d
-mg+kx

detailed solution

Correct option is B

for consevative force F=-dUdx =- -mg+kx2=mg-kx2

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