I'm going to give you a general idea of how to approach these problems. When you are working in any science, but especially in physics, write down every piece of information given in the problem--there are usually only a few types of equations you are learning about at any one time. You then look at the values you have, compare them to the equations you are working on--and amazingly enough, you will usually have all the pieces of information for one type of problem, with a missing piece that will give you your answer. You may have to move the values around so that you get the one you are looking for by itself, but you can do it.

Now look at number 1. You have distance traveled = 8.7 m., angle of takeoff = 23 degrees, and you are looking for takeoff speed (initial velocity.) You may have to use your trig (tangents, sines, and cosines), you may have to use acceleration due to gravity, you may have to draw a picture (in fact, you probably should),to do a step before hand, but is there a formula you have that will work? Look back at the examples given in class, or in your book, and you will find something similar... Write down what you know. Find a formula that uses them. Draw a picture.

You can do this!

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