Question.
An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest ?
An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest ?
Solution:
Work done to bring the object to rest = change in kinetic energy of the object
$=0-\frac{1}{2} \mathrm{mv}^{2}=-\frac{1}{2} \mathrm{mv}^{2}$
Work done to bring the object to rest = change in kinetic energy of the object
$=0-\frac{1}{2} \mathrm{mv}^{2}=-\frac{1}{2} \mathrm{mv}^{2}$