More people end up in u. s. emergency rooms because of fall-related injuries than from any other cause. at what speed v would someone hit the ground who accidentally steps off the top rung of a 9.00 ft tall stepladder? (that step is usually embossed with the phrase "warning! do not stand on this step.") ignore the effects of air resistance. let the +y direction point vertically upward and the origin be on the ground.