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Challenge Problem: A thin rod of mass M-209 kg and length L-0.782 m is suspended from the ceiling by a frictionless pivot point. A ball of putty with mass m-0.754 kg is thrown at the rod at speed v-2.13 m/s and strikes the rod a distance half way down the rod from the pivot point in a perfectly inelastic collision. The combined the rod+putty then recoils upward upward. By what angle will the system deflect from the vertical after the collision? Express your answer in degrees. Hints: The system is set up to conserve angular momentum through the collision. After the collision, the problem can be solved with energy, recognizing that the potential energy change for the rod is just mg times the change in height for the midpoint of the rod (i.e., its centre of mass). Finally, an early version of this problem had the distance in cm and not m and this was a typo
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