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A hobby rocket reaches a height of 81.3 m and lands 136 m from the launch point with no air resistance. What was the angle of launch?

Added Tue, 04 Aug '15

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apply H = u^2 sin ^2 theta/2g

R = u^2 sin 2theta/2g

consider R/H =136/81.3= 2 sin theta cos theta/sin^2 theta

tan theta = 4/1.67

tan theta = 2.39

theta =67.39 deg

Added Tue, 04 Aug '15

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