A ball is thrown from an initial height of 3 meters with an initial upward velocity of 15 m/s. The ball's height h (in meters) after t seconds is given by the following.
h(t) = -4.9t^2 + 15t + 3
This is a quadratic equation that represents the height of the ball at any given time t. The term -4.9t^2 accounts for the effect of gravity, the term 15t represents the initial upward velocity, and the constant term 3 represents the initial height from which the ball is thrown.