Write the definition of work and kinetic energy.
Write the definition of work and kinetic energy.
Work: The product of magnitude of force and displacement during which the force acts is called work,
$\therefore$ Work $=$ Force $\times$ Displacement
If the force and the displacement are in the same direction, the work done is positive and if they are in opposite direction, the work done is negative and if force is perpendicular the displacement, the work done is zero.
Kinetic energy : Energy is the capacity of doing work.
The energy possessed by a body by virtue of its motion is known as kinetic energy.
Hence, if a body moving with more speed would have more kinetic energy compared to the kinetic energy of the same body moving with comparatively lesser speed.
Another definition of kinetic energy : Half of the product of the mass of a body and the square of its velocity is defined as kinetic energy of the body.
$\therefore$ Kinetic energy $=\frac{1}{2} m v^{2}$
where $m=$ mass of body and $v=$ velocity (or speed) of the body.
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