2. An object having mass 'm' kg is raised from ground to a height'h' m. When the force of gravity on mass of 1 kg is 10 N, find (a) the force needed to lift the object (b) the work done in lifting the object and (c) the potential energy stored in the object.
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a) When a body of mass m at A on ground is raised above ground through height h at B force is applied . this force applied = weight of body
force on mass m =F= mg
Where ′g′ is the force of gravity on a mass of 1 kg
(b) Work done in lifting the body = Force × displacement hW=mg×h
(c) This work done W is stored in body in the form of potential energy P.E.mgh
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