An electric motor is used to lift a metal block vertically from the ground to a high shelf. The block is then returned to the ground, and a second motor is used to lift the same block back up to the same shelf.
Which statement must be correct?
The second motor does the same work on the block as the first motor.
The second motor takes the same time to lift the block as the first motor.
The second motor develops the same power as the first motor.
The second motor takes the same time and develops the same power as the first motor.
67 exam-style questions on CIE IGCSE Physics 1.7.2 Work done. Each one has a worked solution and a mark scheme showing where the marks go.