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A 3m long arm OA rotates in a plane such...

A 3m long arm OA rotates in a plane such that 0 = 0.5 t2 where is the angle with x-axis in radian and t is in second. A slider collar B slides along the arm in such a way that its distance from the hinge O is given by r = 3 - 0.412 where r is in meters. Find the speed of the collar at t = 18:- A B В

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