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(B) Displacement is defined as the shortest distance between the initial and final positions of an object.When a body completes half a revolution on a

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$2\,R$

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(B) Displacement is defined as the shortest distance between the initial and final positions of an object.When a body completes half a revolution on a circular path of radius $R$,it moves from one end of the diameter to the other end.The initial position is at one end of the diameter,and the final position is at the diametrically opposite end.The shortest distance between these two points is the diameter of the circle.Therefore,the displacement is equal to the diameter,which is $2 	imes R = 2\,R$.

$A$ body is moving along a circular path of radius $R$. Find the displacement of the body when it completes half a revolution.

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