When the speed of a car is halved, its kinetic energy is
-
A.
doubled -
B.
quartered -
C.
halved -
D.
quadrupled
Correct Answer: Option B
Explanation
Given (K_{1}) = (frac{mv^{2}}{2}).
When v is halved, we have
(K_{2}) = (frac{mtimes (frac{v}{2})^{2}}{2})
= (frac{K_{1}}{4})
Hence, the initial kinetic energy is quartered.