An overhead view of part of a pinball game is shown. If the plunger imparts a speed of 3 m/s to the ball which travels in the smooth horizontal slot, determine the acceleration a of the ball (a) just before it exits the curve at C and (b) when it is halfway between points D and E. Use the values r = 150 mm and θ = 60°.

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E L--x D A B Problem 2/109