1.

A particle is moving in a circular path of radious r the displacement after half a circle would be

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The displacement after half a circle WOULD be 2r[2 * radius}EXPLANATION:This is because when a stone tied[CONSIDER it as object]to a string is MADE to move round a circle the distance between the string being held by our hand and the stone is counted as the radius[starting position]. MOVING it half a circle round means the shortest distance[displacement]between starting point and the position[half a circle or final position], which is 2 times the radius[r]. hence the answer is 2r



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