Block A, shown in the figure below, has a weight of 60 lb and block B has a weight of 10 lb.Determine: 1. The distance sa that A must descend from rest before it obtains a speed of 2.0 ft/s when k1= 2.0 lb/ft and k2 = 3.0 lb/ft (5 points). 2. The distance sa that A descends from rest before it stops for the following combinations of k1 and k2 (10 points). 3. Draw a graph for sa as function of k2 and provide a physical explanation of the phenomenonobserved (5 points).

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