Posted by **Jenny** on Tuesday, September 9, 2008 at 12:27am.

In a projectile motion, if we measure the maximum

height h and horizontal range R

(1) How to get launch angle θ in terms of h and R

(2) A hobby rocket reaches a height of 72.3 m and lands 111 m from the launch point.What is the angle of launch?

What is the launch speed?

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