To move a refrigerator of mass 130 kg into a
house, a mover puts it on a dolly and covers
the steps leading into the house with a wooden
plank acting as a ramp. The plank is 8.2 m
long and rises 2 m. The mover pulls the dolly
with constant velocity and with a steady force
450 N up the ramp.
How much work does he perform? The
acceleration of gravity is 9.8 m/s
2
.
Answer in units of J.