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After soccer practice, Coach Miller goes to the roof of the school to retrieve the errant soccer balls. The height of the school is $3.5\text{ m}$. He kicks a soccer ball which leaves the roof with a horizontal velocity of $15\text{ m/s}$.

Ignoring air resistance, what is the vertical velocity of the ball just before it lands on the ground?

Use the standard convention with upward velocity as positive and downward velocity as negative.


$15\text{ m/s}$


$-15\text{ m/s}$


$8.3\text{ m/s}$


$-8.3\text{ m/s}$

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