I have posted this question twice already and got the same answer, I\'m confused

Question

I have posted this question twice already and got the same answer, I'm confused, can you please type the answers instead of writing them on a piece of paper.

A. When you lift an object to some height,what is the network done on that object?

B. When is the work done on an object equal to the change in its kinetic energy?

C. When is th ework done on an object equal to the change in its potential energy?

D. When is the work done on an object equal to both a change in both its potential and kinetic energy?

Explanation / Answer

A. When an object is lifted to some height, the potential energy of the object increases and the magnitude of the work done=mass of object*acceleration due to gravity*increase in height

B. The work done on an object is equal to change in kinetic energy when the work done on the object totally gets converted into increase in kinetic energy. For example, pulling an object with a force wherein the object is on a horizontal frictionless surface

C. The work done on an object is equal to change in potential energy when the work done on the object totally converts into change in potential energy. For example , lifting an object from one height to another just changes the potential energy of the object.

D. This happens when work done on the object changes both the height and velocity of the object. For example, pulling an object up a frictionless inclined ramp with a force will result in change in both change in height as well as velocity.

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