Kinetic Energy
The energy possessed by a body by virtue of its motion is called kinetic energy. In other words, the amount of work done, a moving object can do before coming to rest is equal to its kinetic energy.
`.^..' '` Kinetic energy, `KE =1/2mv^2`
where, `m` is a mass and `v` is the velocity of a body.
The units and dimensions of KE are Joule (in SI) and `[ML^2T^(-2)]`, respectively.
Kinetic energy of a body is always positive. It can never be negative.
Which of the diagrams shown in figure most closely shows the variation in kinetic energy of the earth as it moves once around the sun in its elliptical orbit?