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A ball is thrown from a window meters above the ground with an initial velocity of m/sec and an angle of inclination of . Let the origin be the point on the (level) ground below the window.

  1. Assume the acceleration due to gravity is m/sec2. Write equations for and .

  2. Determine the angle at which the ball hits the ground.

    First, determine when the ball hits the ground. This is when .

    Then angle is the angle created by the slope.
    Think of drawing a slope triangle and calculating the angle.