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.
An object of mass `10 kg` is moving with velocity of `10 ms^(-1)`. Due to a force, its velocity become `20 ms^(-1)`. Percentage increase in its KE is
Options:
(a) 25%
(b) 50%
(c) 75%
(d) 300%