When the speed of a car is halved, its kinetic energy is
PHYSICS
WAEC 2018
When the speed of a car is halved, its kinetic energy is
- A. doubled
- B. quartered
- C. halved
- D. quadrupled
Correct Answer: B. quartered
Explanation
Given \(K_{1}\) = \(\frac{mv^{2}}{2}\).
When v is halved, we have
\(K_{2}\) = \(\frac{m\times (\frac{v}{2})^{2}}{2}\)
= \(\frac{K_{1}}{4}\)
Hence, the initial kinetic energy is quartered.
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