You want to apply a force on a box so that it moves with constant speed across a horizontal floor. The coefficient if kinetic friction between the box and the floor is `mu_(k).` Of the flur following cases, the force you apply on the box will be smallest when you

Options

A. push it with a force applied horizontally at an angle `0 lt theta lt 90^(@)` in downword direction.
B. pull it with a force applied horizontally at the same angle as in (A), in upward direction.
C. do either (A) or (B) since the applied force is the same.
D. push or pull with a force applied horizontally.

Answer

B