Question

A net external force acts on a particle that is moving along a straight line. This net force is not zero. Which one of the following statements is correct?

(a)The velocity, but not the kinetic energy, of the particle is changing.
(b)The kinetic energy, but not the velocity, of the particle is changing.
(c)Both the velocity and the kinetic energy of the particle are changing.

Answer 1

The answer is (c) Both the velocity and the kinetic energy of the particle are changing when a net external force is applied to it. This is due to Newton's second law and the formula for kinetic energy.

Step-by-step explanation:

Assuming no other forces are present, the correct statement is (c) Both the velocity and the kinetic energy of the particle are changing. When a net external force is applied to a particle, according to Newton's second law of motion, it will cause an acceleration (change in velocity). As the velocity changes, the kinetic energy (which is 1/2 * mass * velocity^2) of that particle also changes. Thus, when a non-zero net external force acts on a particle, both its velocity and kinetic energy are changing.

Learn more about Force and Motion