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.
Two masses of `1 g and 4 g` are moving with equal kinetic energy. The ratio of the magnitudes of their momentum is
Options:
(a) `4 : 1`
(b) `sqrt2:1`
(c) `1:2`
(d) `1:16`