(Answered) Calculate the time in seconds for a solid sphere starting

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Calculate the time in seconds for a solid sphere starting at rest to roll down an incline without slipping. Assume the initial height of the sphere is 1 meter and the incline has an angle 45 degrees. Ignore air friction and use g=9.8m/s^2 (Drive the result from first principles). B)Same question but for a solid cylinder. C) Which one wins in a race?

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