A particle moves from point A to point B subject to a conservative force and a n

Question

A particle moves from point A to point B subject to a conservative force and a nonconservative force. If the nonconservative force does 100 J of work on the particle as it moves from A to B, what is the mechanical energy at B? (mechanical energy = E = K + U)

200 J larger than the mechanical energy at A

100 J larger than the mechanical energy at A the same as the mechanical energy at A

100 J smaller than the mechanical energy at A

200 J smaller than the mechanical energy at A

As an object moves from point A to point B only two forces act on it: one force is non-conservative and does ?30 J of work, the other force is conservative and does +50 J of work. Between A and B, the object's

kinetic energy increases and its total mechanical energy decreases.

kinetic energy increases and its total mechanical energy increases.    

kinetic energy decreases and its total mechanical energy increases.

kinetic energy increases and its total mechanical energy remains constant.

A box of mass 20 kg slides from rest at the top of the incline shown to the bottom where it is 3 m vertically below and 12 m horizontally to the right of its initial position. If the block's speed at the bottom is 6 m/s what was the work done on the box by friction?

+130 J

-230 J    

-130 J

+950 J

+230 J

Explanation / Answer

-230j

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