A 5-Kg Mass Is Pulled Up a Smooth Incline at a Constant

Multiple Choice

A 5-kg mass is pulled up a smooth incline at a constant speed by a rope. The rope is parallel with the surface of the incline. If the incline is 50° relative to the horizontal, the normal force exerted by the incline on the mass is

A) 28 N.
B) 38 N.
C) 31 N.
D) 45 N.