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12-39.
  1. A ball is thrown from a window 25 meters above the ground with an initial velocity of 40 meters per second and an angle of inclination of . Let the origin be the point on the (level) ground below the window. Homework Help ✎

    1. Assume the acceleration due to gravity is −10 . Find x(t) and y(t).

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

First, determine when the ball hits the ground. This is when y(t) = 0.

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