You Need to Move a Heavy Crate by Sliding It

Multiple Choice

You need to move a heavy crate by sliding it across a smooth floor-either by pushing it horizontally or by pulling it with a rope that makes a 30^o angle with the floor. If the coefficient of kinetic friction is 0.25, which way should you move the crate so that you do the least amount of work?

A) Pushing it horizontally.
B) Pulling it with a rope that makes a 30^o angle with the floor.
C) Either way the work done will be the same.
D) More information is needed to work out the answer.