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)

(A) 100 J smaller than the mechanical energy at A

(B) 100 J larger than the mechanical energy at A    

(C) 200 J larger than the mechanical energy at A

(D) the same as the mechanical energy at A

(E) 200 J smaller than the mechanical energy at A

Explanation / Answer

(A)100 J smaller than the mechanical energy at A

Reason- work done by "external" forces = change in kinetic energy. So, here KE reduces by 100J

But non conservative force does not change the PE.

hence ans is A.

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