A Man Wishes to Pull a Crate 15 M Across

Multiple Choice

A man wishes to pull a crate 15 m across a rough floor by exerting a force of 100 N. The coefficient of kinetic friction is 0.25. For the man to do the least work, the angle between the force and the horizontal should be:

A) 0
B) 14 °
C) 43 °
D) 66 °
E) 76 °