A 1.6-kg block slides down a plane (inclined at 25 with the horizontal) at a constant speed of 2.0 m/s. At what rate is the frictional force changing the mechanical energy of the block?
a. +28 W
b. +13 W
c. -13 W
d. -28 W
e. +6.5 W
Question 2
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
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