Question

The work done by the external forces on a system equals the change in
(a) total energy
(b) kinetic energy
(c) potential energy
(d) none of these

Answer 1

Answer ⇒ Option (a). Total Energy.

Explanation/Reason. ⇒ 
As per as the law of the conservation of the Energy, total mechanical energy remains the constant. Thus, External Forces on the system will either change there kinetic energy or the potential energy but the total mechanical energy remains the constant. Hence, the total work done by the External force will completely changes into the total energy. 


Hence, option (a) is correct.


Hope it helps.

Answer 2

Answer:

option a total energy

Explanation:

external forces are denoted by sum of kinetic energy and potential energy which is equal to total energy