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Suppose an object moves along the diameter of a semicircle of radius r. With what speed does it's shadow move on the semicircle if the object moves with a constant speed of v, when it is at a distance x from the centre of the diameter?

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Welcome to Physics.SE. You almost certainly need to provide an picture for this question to make sense, though I assume the light comes from a arbitrarily distant source. Secondly, this looks like a introductory homework exercise, which our FAQ does not allow. We do allow conceptual questions about basic ideas, and there may be one here. You are welcome to edit the question to put it into conceptual terms and we will re-open. – dmckee♦ May 22 '12 at 16:18

closed as too localized by dmckee♦ May 22 '12 at 16:18

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