When the speed of a car is halved, its kinetic energy is?

A. doubled
B. quartered
C. halved
D. quadrupled

Correct Answer: Option B

B. quartered

Explanation

Given K1 = mv²/2.

When v is halved, we have

K2 = m×(v/2)²/2

= K1/4

Hence, the initial kinetic energy is quartered.