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If an object of mass 5 kg is lifted from ground to the top of the table which is 2 m above the ground then calculate the work done by the gravitational force acting on the object.Select one:A +98JB. -98JC. 0JD. 15J |
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Answer» B. -98JExplanation:Work done = FORCE x distanceW = F.das the force due to gravity (weight) is equal to "MG"since the force (gravity) is OPPOSITE to the displacement, therefore it's value will be negativeW= -(mg).dputting the values,W= -(5 x 9.8) x 2 = -49 x 2 = -98J |
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