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Please answer 9-11. Thank you. Only answer if you know all.
9. A ball attached to a string of length 60 em is spun in a uniform circle with a constant velocity at the rate of 10 rev/s. What is the centripetal acceleration of the ball? 10. A car drives with constant speed of 90 km/h around a roundabout with a diameter of 50 m. What is the centripetal acceleration of the car? 11. The velocity of a particle is v)(-2t) i+ (6t+2) jm/s what is the magnitude and direction of the acceleration of the particle at 1 # 3s?
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