# Having trouble understanding projectile motion [closed]

So, I learned about projectile motion in class a fe days ago, and am having trouble understanding. I main problem is seeing how velocity works in projectile motion. For example, why is the velocity in the x direction always the same?

It would also be really helpful if you can do the example below:

In 1993,Wayne Brian threw a spear a record distance of 201.24 m. Suppose Brian threw the spear at a 35.0° angle with respect to the horizontal. What was the initial speed of the spear?

## closed as off-topic by ACuriousMind♦, user36790, Gert, garyp, DilithiumMatrixDec 30 '15 at 19:23

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• "Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See our meta site for more guidance on how to edit your question to make it better" – ACuriousMind, Community, Gert, garyp, DilithiumMatrix
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• Please do a little research before asking a basic question: en.wikipedia.org/wiki/… – Gert Dec 30 '15 at 18:11
• You could watch a youtube video on projectiles instead of asking what it is on SE. I suppose SE is not the place to get answers for problems which you can solve on your own by putting in a little effort. – Quark Dec 30 '15 at 20:43