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A projectile is launched upward from ground level at an angle of $30 ^\circ$ above the horizontal.

If the ball remains aloft for $4\ \text{s}$ before returning to ground level, at what speed was it launched?

A

$5\ \text{m/s}$

B

$10\ \text{m/s}$

C

$20\ \text{m/s}$

D

$40\ \text{m/s}$

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