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This is my first post, and I regret that it has to be a question that is so elementary.

The Problem:

I am in an introductory engineering course in which we were divided into teams and told to construct a catapult. Rather than follow design requirements, and despite my protest, my team constructed a catapult the hurls our ping pong ball into the ground at angles that I refer to as negative launch angles.

Here is a link to a photo of our catapult and what's going on:

http://s872.photobucket.com/albums/ab287/uzzimike86/?action=view¤t=FailedCatapult.png

I can never figure out how to get the photo to just load straight into the post. Sorry.

They are calling our launch angles 85, 100, and 115 degrees. They are referencing from the horizontal. Is this correct? In my mind I am thinking the launch angles are actually 5, -15, and -25 degrees.

The Question:

Are the launch angles 85, 100, and 115 degrees, or are the 5, -10, and -25 degrees?

I appreciate your time in reading through my situation and thanks in advance for any response that will settle this problem.