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Q.
When velocity of a moving car decreases by applying sudden brake, then its kinetic energy,
Work, Energy and Power
Solution:
When velocity of car decreases, then its kinetic energy decreases because kinetic energy of car is directly proportional to the square of its velocity.
i.e. $K=\frac{1}{2} m v^{2}$
or $K \propto v^{2}$