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Question: 9 a ball attached to a string of length 60...

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9. A ball attached to a string of length 60 cm is spun in a uniform cirele 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(t) (e-2) i + (61 + 2) jm/s What is the magnitude and direction of the acceleration of the particle at t-3s?
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