A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400.He exerts a force F sufficient to accelerate the crate forward.At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration?
A) 21.8°
B) 27.7°
C) 30°
D) 34.5°
E) 45°

Question

Quizplus · Accepted Answer

The correct choice is A because the coefficient of kinetic friction is 0.400, so the angle above horizontal should be 21.8° in order to achieve the maximum acceleration.

A Person Is Dragging a Packing Crate of Mass 100