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Need to use Multivariable Calculus to solve the question. Basic projectile motion algebra equations cannot be...

Need to use Multivariable Calculus to solve the question. Basic projectile motion algebra equations cannot be used!

A catapult can throw a 80 lb rock up to 100 yards. The maximum height the rock reaches as it flies through the air toward a fortress wall 100 yards away is 20 yards, calculate the speed and angle at which the rock leaves the sling of the catapult. USE VECTOR CALCULUS!
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