First slide

Work Energy Theorem

Question

The work done by the external forces on a system equals the change in

Easy

A

total mechanical energy
B

kinetic energy
C

potential energy
D

Both 2 & 3

Solution

If the system consists of a number of bodies interacting with each other through gravitational, electromagnetic or elastic forces, then work done by external forces acting on the system may change both kinetic and potential energy of the system. But when the system consists of a single body, work done by external forces changes its K.E. only. Hence in general, option (1) is correct.

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