In lab you roll a marble off the edge of your table, and it goes flying through the air until it hits the floor 2.0 m out on the floor from below the launch point.  (That's distance along the floor from just below where the marble became airborne to the point on the floor where it landed.)  The table is level, so the marble is moving horizontally when it first becomes airborne.  If the marble exited the table at 4.0 m/s … iii) What was the angle below the horizontal of the velocity of the marble just before it hit the floor?

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Projectile Motion