When the speed of a car is halved its kinetic e... - WAEC Physics 2018 Question
When the speed of a car is halved, its kinetic energy is
A
doubled
B
quartered
C
halved
D
quadrupled
correct option: b
Given \(K_{1}\) = \(\frac{mv^{2}}{2}\).
When v is halved, we have
\(K_{2}\) = \(\frac{m\times (\frac{v}{2})^{2}}{2}\)
= \(\frac{K_{1}}{4}\), which is a quater
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