The sum of kinetic and potential energy is called :

What are the conditions needed for work to be done?

i. A force should act on an object.

ii. The object must be displaced.

iii. There should be a chemical energy applied.

Which of the following statements are true?

i. Work done by a force acting on an object is equal to the magnitude of the force multiplied by the distance moved in the direction of force.

ii. Work has only magnitude and no direction.

iii. Here the unit of work is $\mathrm{newton} \mathrm{metre}, \mathrm{joule}.$

iv.There are two conditions need to be satisfied for work to be done.

What is the unit of work?

i.$\text{Newton metre}$

ii.$\text{Joule}$

iii. $\text{Ampere}$

iv. $\text{Coulomb}$