If the effects of atmospheric resistance are accounted for, a freely falling body has an acceleration defined by the equation a = 9.81[1-v^2 (10^ -4)] m/s^2,where v is in m/s and the positive direction is downward. If the body is released from rest at a very high altitude, determine (a) the velocity when t = 5s, and (b) the body's terminal or maximum attainable velocity (as t > infinity).