Question

The work-energy theorem states that the work done by a force on a body is equal to the change in kinetic energy of the body.

• A. True
• B. False

Answer 1

The correct option is A

True

When a force is applied in the direction of motion of a body, it accelerates the motion and thus increases the kinetic energy of the body. This increase in kinetic energy is equal to the work done by the force on the body. So according to work-energy theorem, the work done by a force on moving a body is equal to the increase in kinetic energy of the body.

Hence, $W=\frac{1}{2}m{v}^2-\frac{1}{2}m{u}^2,$ where $v$ is the final velocity and $u$ is the initial velocity.