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An object is attached horizontally on a frictionless surface to a given spring which obeys Hooke's Law. When the object is at some position A, the force felt by the object from the spring is $F = -2.4 N$ and the potential energy in the spring is $U = 2.4 J$. At some different position B, the force felt by the object is $F = -12 N$.

What is the potential energy stored in the spring when the object is at position B?

A

12 J

B

50 J

C

60 J

D

100 J

E

120 J

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