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CBSE Class 9 Answered

what is the derivation of kinetic energy ?
Asked by bansari Butani | 11 Jan, 2014, 06:10: PM
answered-by-expert Expert Answer

Kinetic energy - The energy possessed by virtue of its motion is said to be kinetic energy.

K E = 1/2mv2

Derivation : We know that,

W = f x s          

but f = ma

W = mas    ….. (1)

By 3rd eqn of motion,

v2 = u2 + 2as

at rest, u=0

v2 = 2as

as = 1/2 v2

Substituting in eqn 1, we get,

W = 1/2 mv2

Since work done is stored in kinetic energy.

so, K.E. = 1/2 mv2

 

Answered by Faiza Lambe | 11 Jan, 2014, 07:18: PM

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