At a certain instant, the 80-lb crate has a velocity of 30 ft /sec up the 20° incline. Calculate the time t required for the crate to come to rest and the corresponding distance d traveled. Also, determine the distance d′ traveled when the crate speed has been reduced to 15 ft /sec.

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Vo = 30 ft/sec 80 lb 20 g = 0.40 Hk = 0.25