A 40-Kg Block Is Pushed Up a 36° Incline by a a Force

Multiple Choice

A 4.0-kg block is pushed up a 36° incline by a force of magnitude P applied parallel to the incline. When P is 31 N, it is observed that the block moves up the incline with a constant speed. What value of P would be required to lower the block down the incline at a constant speed?

A) 27 N
B) 15 N
C) 13 N
D) 17 N
E) 19 N