Which of the following statements is/are incorrect for energy?

(i) Energy is destroyed due to frictional forces. (ii) Energy is the measure of the ability to do work. (iii) Energy and power both measure the same quantity.

Statement (i) is incorrect. According to law of conservation of energy, ‘Energy can neither be created nor destroyed’. Statement (ii) is correct. Energy is defined as the ability to do work. Statement (iii) is also incorrect. Energy measures the ability to do work, while ‘power’ is the time rate at which work is done or energy is transferred.