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.
The kinetic energy of an air molecule `(10^(-21) J)` in `eV` is
Options:
(a) `6.2meV`
(b) `4.2meV`
(c) `10.4meV`
(d) `9.7meV`