If the effects of atmospheric resistance are accounted for, a freely falling body has an acceleration defined by the equation below where v in m/s and the positive direction is downward. a = 9.81 [1-v2 (10-4 )] (m/s2 ) if the body is released from rest at a very high altitude, determine the body’s terminal or maximum attainable speed (as time approaches infinity). velocity is maximum when acceleration is zero!