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.

Answer 1

Dude it's so simple it's kinetic energy that's all because by definition, the amount of kinetic energy acquired by an object is equal to the work done to help it acquire the energy!
So if you don't understand consult me afterwards.

Answer 2

Answer:

Kinetic energy of an object of mass, moving with a velocity, v is given by the expression,

E k= 1/2 mv^2

To bring the object to rest, 1/2 mv^2amount of work is required to be done on the object.