A scientist uses an electric motor to lift a load through a vertical distance of 2.0m.
He then increases the input power to the motor and repeats the experiment. The efficiency of the
motor does not change.
Which row correctly describes the effect that this has on the useful work done lifting the load and
the time taken to lift it?
work done
A
decreases
B
stays the same
decreases
time taken
decreases
decreases
stays the same
stays the same
с
D
stays the same
