Work = (force) x (distance)
As the load is lifted, its gravitational potential energy
increases by
(1.3 x 10⁴ N) x (1.5 m) = 19,500 joules
every second. THAT's the energy that the motor must provide.
19,500 joules/second = 19,500 watts .
That's the minimum. If there are frictional losses in the works,
gears, cables, or guts of the elevator, then the motor must provide
the extra energy required to overcome those too
.
