The 100-lb block is stationary at time t = 0, and then it is subjected to the force P shown. Note that the force is zero for all times beyond t = 15 sec. Determine the velocity v of the block at time t = 15 sec. Also calculate the time t at which the block again comes to rest.

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P, lb 60 30 SHs = 0.50 100 lb H = 0.35 10 15 t, sec