Question

PLS ADD STEP BY STEP SOLUTIONS
Joe needs to lift a 90 kg box onto a shelf that is 1.2 m high.
a) How much work has he done if he lifts the box straight up?
b) To make the work easier, Joe decides to push the box up a 4.0 m ramp instead. To do this, he must push with a force of 300 N. How much work has he done using the ramp?
c) What is the percent efficiency of the ramp?

Answer 1

c) What is the percent efficiency of the ramp?:3