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January 28, 2015

January 28, 2015

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

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?

- physics -
**drwls**, Tuesday, September 9, 2008 at 12:45amLet θ be the launch angle. Assume the ground is level. Let V be the launch speed.

R = 2 (V^2/g) sin θ cos θ

h = V^2 sin^2 θ / (2g)

R = 4 h cosθ/sin θ = 4 h cotθ

Check my thinkng.

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