Question

A body of mass 3kg is pulled up along an inclined plane through a vertical height of 2m. What is the work done?​

Answer 1

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⚡Yes, the work done will be in the form of potential energy. As the displacement is in the direction opposite to the force acting i.e gravitational force, the work done will be negative.

°.° W = -mgh

= - 3 × 9.8 × 2

= - 58.8 Joules

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.

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Answer 2

Given:

A body of mass 3kg is pulled up along an inclined plane through a vertical height of 2m.

To find:

Work done by operator ?

Solution :

First of all, we need to understand the fact that GRAVITATIONAL FORCE IS A CONSERVATIVE FORCE , hence the work done will be solely dependent upon the final position of the particle instead of the path of the particle.

Even if the body was pulled up along an inclined plane during calculation we need to take only the vertical height in consideration.

Now, the work done to lift the object to that certain height it will be stored as the potential energy in the object.

$\sf \therefore \: work = potential \: energy$

$\sf \implies \: work = m \times g \times h$

$\sf \implies\: work = 3 \times 10 \times 2$

$\sf \implies\: work = 60 \: joule$

So, work done is 60 Joules.