A scientist uses an electric motor to raise a load by a vertical height of $2.0\,\text{m}$. He then raises the input power supplied to the motor and carries out the experiment again. The efficiency of the motor remains unchanged. Which row correctly shows the effect of this on the useful work done lifting the load and the time needed to lift it?
- Awork done decreases, time taken decreases
- Bwork done stays the same, time taken decreases
- Cwork done decreases, time taken stays the same
- Dwork done stays the same, time taken stays the same