A weight lifter lifts a 200 kg barbell from the floor to a position directly over his head 2.5 meters. How much work did he do?

Answer 1

Work = force * distance
here force = mass times acceleration of gravity
distance is height difference, h
m g h

200 * 9.81 * 2.5
Joules if m in kg, g in meters/s^2 and h in meters