Consider a circle of radiusrcentred at O. There are two points A and B chosen on the circle such thatAn ant is moving on this circle with a constant speedv.Find the change in velocity in moving from A to B for the ant.

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Expression for change in velocity:

Δv=v12+v22-2v1v2cosθ   =v2+v2-2vvcos40   =2v2-2v2cos40   =2v1-cos40   =2v1-(2sin220-1)   =2v2sin220   =2vsin20

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