You and your roommate plot to drop water balloons on students entering your dorm. Your window is 30 m above the sidewalk. You plan to place an X on the sidewalk to mark the spot a student must be when you drop the balloon. You note that most students approach the dorm at about 3 m/s .
the X should be marked on the sidewalk at a horizontal distance of D meters from the base of the dorm window for the water balloon drop to hit a student walking at 3 m/s.
