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The highest barrier that a projectile can clear is 15.8 m, when the projectile is launched at an angle of 13.4° above the horizontal. What is the projectile's launch speed?

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"vertical" kinetic energy = max potential energy change.
(Horizontal kinetic energy does not change)

(Vo sin13.4)^2/2 = 2g H

Solve for Vo.

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