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*15.  The drawing shows a device that can
be used to measure the speed of a bullet. The device consists of two
rotating disks, separated by a distance of d = 0.850 m, and rotating with an angular speed of 95.0 rad/s. The bullet first passes through the
left disk and then through the right disk. It is found that the angular
displacement between the two bullet holes is q = 0.240 rad. From these data, determine the speed of the
bullet.
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