NEET Physics Question - Work Energy and Power

Assertion (A): Kinetic energy of a system can be increased without applying any external force on the system.

Reason (R): If external forces are absent then work done by internal forces is equal to change in kinetic energy.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

According to the work-energy theorem, `\(W_{net} = \Delta KE\)`. If external forces are absent, the net work done on the system is only due to internal forces, i.e., `\(W_{int} = \Delta KE\)`. Thus, internal forces can increase kinetic energy, for example, in an explosion. Both assertion and reason are true, and the reason correctly explains the assertion.

Rankers Physics

Kinetic energy and internal forces

Solution:

Leave a Reply Cancel reply