Question

The work done by a body while covering a vertical height of 5m is 50 kJ. By how much amount has the energy of the body changed?

(a) 50 kJ

(b) -50 kJ

(c) 25 kJ

(d) 10 kJ

This question was addressed to me by my school principal while I was bunking the class.

I need to ask this question from Work-Energy Theorem topic in portion Work, Energy and Power of Physics – Class 11

Answer 1

Correct option is (a) 50 kJ

Explanation: The work done by the body is 50 kJ. Hence by the work-energy theorem, we can say that the total change in energy is equal to the total work done. Therefore, the total change in energy is 50 kJ. Since only the ‘amount’ has been asked, the sign, which denotes the direction of energy transfer, does not matter.