Question

In a two dimensional motion, instantaneous speed is a positive constant. Then which of the following are necessarily true?

• A. The acceleration of the particle is zero
• B. The acceleration of the particle is bounded
• C. The acceleration of the particle is necessarily in the plane of motion
• D. The particle must be undergoing a uniform circular motion

Answer 1

Answer: (C)

The acceleration of the particle is necessarily in the plane of motion

Answer 2

In two dimensional motions, if instantaneous speed is a positive constant, then the accelerations of the particle is necessarily in the plane of motion.