The sack of cement has a weight of \(90 \mathrm{lb}\). If it is dropped from rest at a height of \(h=4 \mathrm{ft}\) onto the center of the W10 \(\times 39\) structural steel A-36 beam, determine the maximum bending stress developed in the beam due to the impact. Also, what is the impact factor?

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T h 12 ft 12 ft