When does a force do work?

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Solution

Work is said to be done only when the force applied on a body makes the body moves (i.e., there is displacement of the body).

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20 N

8.0 m

Statement 1: Force acting on a body increases its kinetic energy from 200 J to 400 J and this force does a positive work on the body.

Statement 2: A force does a positive work on an object when the displacement is in the direction of force itself.

Statement 1: A positive work can increase the kinetic energy.

Statement 2: A force does a positive work on an object when the displacement is in the direction of force itself.

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