A shot is fired at \( 30^{\circ} \) with the vertical from a point on the ground with kinetic en...

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A shot is fired at \( 30^{\circ} \) with the vertical from a point on the ground with kinetic energy \( K \). If air resistance is ignored, the kinetic energy at the top of the trajectory is
a. \( 3 K / 4 \)
b. \( K / 2 \)
c. \( K \)
d. \( K / 4 \)
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