% efficiency = AMA/IMA x 100
AMA = resistance force / effort force
IMA = effort distance / resistance distance
a lever is nine meters long. a load placed at one end, three meters from the fulcrum. the load is 6,000 newtons. the effort force of 4,000 newtons is six meters from the fulcrum.
(a) calculate the IMA
(b) Calculate the AMA
(c) calculate the efficiency (in %)