Adaredevil is shot out of a cannon at 45.0° above horizontal with an initial speed of 25.0 m/s. a net is positioned a horizontal distance of 50.0 m from the cannon. at what height above the cannon should the net be placed in order to catch the daredevil?

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.