An object weighing 32 lb is released from rest 50 ft above the surface of a calm before the object reaches the surface of the lake, the air resistance (in pounds) given by 2v, where v is the velocity (in feet per second). after the object passes surface, the water resistance (in pounds) is given by 6v. further, the object is the up by a buoyancy' force of 8 lb. find the velocity of the object 2 seconds after i beneath the surface of the lake.