You need to raise a heavy block by pulling it with a massless rope. You can either

Question:

You need to raise a heavy block by pulling it with a massless rope.
You can either

(a) Pull the block straight up height h,

(b) Pull it up a long, frictionless plane inclined at a 15° angle until its height has increased by h. Assume you will move the block at constant speed either way. Will you do more work in case a or case b? Or is the work the same in both cases? Explain.