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A marble is launched horizontally at $15\ \text{m/s}$ from the top of a tall building.

Assuming that air resistance is negligible, which of the following is closest to the marble's speed at a time $2$ seconds after it is launched?

A

$15\ \text{m/s}$

B

$20\ \text{m/s}$

C

$25\ \text{m/s}$

D

$35\ \text{m/s}$

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