An object is shot straight upward from sea level with an initial velocity of 550 ft/sec. a. Assuming that gravity is the only force acting on the object, give an upper estimate for its velocity after 5 sec have elapsed. Use g = 32 ft/sec for the gravitational acceleration. b.Using At = 1 sec, find a lower estimate for the height attained after 5 sec. . . . a. The upper estimate for the velocity after 5 sec is ft/sec