Question

Can kinetic energy of a particle be negative? Explain.

Answer 1

The kinetic energy of a particle can't be negative.

1. We know, kinetic energy (KE) = $\frac{1}{2}m{v}^2$, where m is mass and v is the velocity of the particle.
2. Both mass and square of velocity are always positive.
3. Hence kinetic energy is always positive.