Question

(a) derive an expression for the potential energy of a body.

(b) when do you say that work is done?

(c)a porter lifts a luggage of 15kg from the ground and puts on his head 1.5 m above the ground . Calculate the work done by him in lifting the luggage.

Answer 1

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a) this answer is in the attachment .

b) work is done when a force produces motion .Work done in moving body is equal to the product of force exerted on the body and the distance moved by the body in the direction of force .

c) solve it using expression of potential energy:-

= mgh


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