Projectile Motion Help: Solving Cannon Ball Problems

AI Thread Summary
The discussion focuses on solving two projectile motion problems involving a cannon ball. The first problem requires calculating the initial velocity needed for a cannon ball launched at 60 degrees to hit a helicopter 90 feet away and 70 feet high, with an initial attempt yielding 43 m/s and a time of 3.8 seconds, but the x and y components are inconsistent. The second problem involves finding two launch angles for a cannon ball traveling at 35 m/s to land 29 meters away, with the poster expressing uncertainty on how to begin. Participants are encouraged to share their calculations to clarify the approach to these problems. The thread emphasizes the importance of breaking down the components of projectile motion for accurate solutions.
nando94
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I am really stuck on these two homework problems.

1. Basically, there is a cannon which will launch a ball at 60 degrees respect to the x axis. There is also a helicopter 90 feet away from the cannon and 70 feet up. What intial velocity will the cannon ball need to be launched with in order to hit the helicopter.

For this one I got vi = 43 m/s and t = 3.8 s but the x and y components don't add up

2. Find the two angles that will ensure that a cannon ball traveling at 35 m/s will land 29 meters away.

Dont know where to start on this.
 
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