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7. A ball attached to a string of length 0.4 meters is whirled around in a circular path. It experiences a centripetal acceleration of

7. A ball attached to a string of length 0.4 meters is whirled around in a circular path. It experiences a centripetal acceleration of 40 m/s. a. What is the tangential velocity of the ball? b. How long does the ball take to make one complete revolution?

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