Question

The kinetic energy of a body changes from 8 J to 12 J. If there is no energy loss, then the work done is :

• A. 64 J
• B. 16 J
• C. 4 J
• D. 2 J

Answer 1

Answer:

C. 4 J

To find the work done when the kinetic energy of a body changes,

you can use the work-energy theorem,

which states that the work done on an object is equal to the change in its kinetic energy.

Given:

• Initial kinetic energy, KE1=8 J

• Final kinetic energy, KE2=12 J

The work done, W, is the change in kinetic energy:

W=KE2−KE1=12 J−8 J=4 J

Thus, the work done is 4 J, which is correct.