Johnny kicked a football from a hill 20 meters tall. The ball leaves at a 45.0 degree angle with an initial velocity of 30.0 m/second. How many seconds was the ball in the air? Report your answer to 3 sig figs. Seconds

The value is

Explanation:

From the question we are told that

   The height of the tree is

    The angle the ball leaves is  

    The initial velocity  is  

Generally the vertical of the ball's initial velocity is mathematically evaluated as

=>  

=>  

Here   is negative because it is in the direction of the negative y-axis

Generally from kinematic equation we have

=>  

=>  

Solving using quadratic formula we have that

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