When the speed of a car is halved, its kinetic energy is<...
When the speed of a car is halved, its kinetic energy is
doubled
quartered
halved
quadrupled
Correct answer is B
Given K1 = mv22.
When v is halved, we have
K2 = m×(v2)22
= K14
Hence, the initial kinetic energy is quartered.
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