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A 5 Kg box initially at rest slides down a ramp with friction acting on the...

A 5 Kg box initially at rest slides down a ramp with friction acting on the box. At the top of the ramp the box has a potential energy of 120 J. At the bottom, its kinetic energy is 30 J and the work done by the friction has a magnitude of 20 J. What is the mechanical energy of the box at the bottom of the ramp?

A. 120J

B. 150J

C. 110J

D . 140J

E. None of these

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