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18_angle_projectile - Lesson 18 Projectile Motion at an...

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Lesson 18: Projectile Motion at an Angle To do questions involving objects launched from the ground upwards at an angle (like kicking a football up into the air and watching it as it arcs in the air and comes back down), you need to add a few more steps to the way you did the questions for objects launched horizontally . There are actually two ways to do these types of problems, one based on the vertical velocity of the object, the other based on the vertical displacement . The only big difference in these methods is how we are going to calculate the time that the object spends in the air. Choose whichever method you are most comfortable with, and whichever one suits the particular question you are doing. We will look at each and then it’s up to you to figure out which way you will approach a problem. Imagine for a moment that you are watching an object as it rises into the air after you kick it upwards at an angle. Look at Illustration 1 below as you read through this description. When it left your foot, it was going at the fastest that it can possibly move during its flight. The instant it leaves your foot, gravity is pulling down on it, causing it to have less and less vertical velocity .
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