Alan will use a compound pulley to create a lift from the floor of his garage to a storage shelf. the shelf is 3.5 meters above the floor Alan pulls 10.5 meters of rope to lift a crate. which statement is correct

Question

alan uses three tomes the force he would have used without the compound pulley
alan uses the same amount of force with the compound pulley as he would without it
alan will save work by using the compound pulley
alan uses one third the force he would have needed without the compound pulley

Answer 1

Alan will save work by using the compound pulley.

Answer 2

Thank you so much!

Answer 3

its D