A girl of mass 60 kg uses 5100 J of energy when she climbs a vertical rope.
(a) Calculate the maximum height it would be possible for the girl to reach.
(b) In reality, the girl reaches a height of only 8 m.
Explain why the energy used by the girl during the climb does not equal the work she does to reach the vertical height of 8 m.
In your answer you should:
• name the type of energy the girl has when she is 8 m above the ground
• calculate the work done to reach a height of 8 m above the ground
• calculate the difference between the work done and the energy used by the girl
• explain where the “missing” energy has gone, and why this occurs.
At Work Done, is energy used or gained?