March 30, 2017

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A 3.0-kg block is on a frictionless horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 2.0 N) acting at an angle of 22° above the horizontal is applied to the block. At what rate is the force P doing work at t = 2.0 s?
A. 2.3 W
B. 2.0 W
C. 1.4 W
D. 1.7 W
E. 1.2 W

correct answer is A

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