Question

define kinetic energy derive and expression for the kinetic energy of a body​

Answer 1

Answer:

The energy by virtue of motion is called as kinetic energy. An object that has motion, whether it may be vertical or horizontal motion, has kinetic energy. Kinetic energy depends on mass(m) of the object and speed (v) of the object. The equation used to represent kinetic energy is: KE=12mv2.

Explanation:

Answer 2

Kinetic Energy

The energy due to motion of an object is called kinetic energy. Kinetic energy is denoted by K.E or KE or simply k. Objects in motion have energy so they can do work.Work and energy due to motion have direct relationship.This energy due to motion is called kinetic energy of the object.

Derivation of KE

we know that F=ma

And v²-u²=2as,if body starts from rest then u=0=s=v²/2a

By definition

The KE of a body moving with a certain velocity is equal to the work done on it to make it acquire the velocity

KE=WD=FS

KE=(ma)×(v²/2a)

KE=(mv²)/2