Question

If the speed of a particle is doubled, what happens to its kinetic energy?

A. It doubles.

B. It quadruples.

C. It decreases by square root of 2.

D. It decreases by a factor of 2.

E. None of these.

Answer 1

When the speed of a particle is doubled, its kinetic energy increases by a factor of four.

Step-by-step explanation:

When the speed of a particle is doubled, its kinetic energy increases by a factor of four. This is because kinetic energy is directly proportional to the square of the velocity. Doubling the speed means squaring the velocity, resulting in a fourfold increase in kinetic energy.