a cannon is launched @ 30deg angle above the horizontal with an unknown velocity the projectile is observed to hit a vertical wall at a horizontal distance of 100.0m and it hits a height of 15.0m above the ground, find the initial velocity.(adsbygoogle = window.adsbygoogle || []).push({});

the following is what i did to solve it, but the fact that i didnt even use the 30deg at all throughout the solution has me second guessing my solution, so i was wondering if anyone could point out what i did wrong

any help is appreciated

thanks

http://desi.thriceshy.com/images/1440scan.jpg [Broken]

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Projectile motion help

**Physics Forums | Science Articles, Homework Help, Discussion**