Question

A person says that he measured the acceleration of a particle to be non-zero even though no force was acting on the particle.

Options

• He is a liar.

• His clock might have run slow.

• His metre scale might have been longer than the standard.

• He might have used a non-inertial frame.

Answer 1

He might have used a non-inertial frame

If no force is acting on a particle and yet, its acceleration is non-zero, it means the observer is in a non-inertial frame.