Question

Derivation of kinetic energy?? Plzz tell me in easy way​

Answer 1

hope it helps.
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Answer 2

Actually, the only way we can derive kinetic energy is by some rigouous calculus.

However, if we look deep down into the book Principia by Sir Newton
Kinetic energy is a defined quantity for all particle behaving matter in the universe

Kinetic energy is defined as the product of Momentum and velocity of the body

The numeric 1/2 in the formula is actually obtained when we are deriving the formula from integral calculus.

Hope this helps you !