![]() The lengths of the vector arrows are representative of the magnitudes of that quantity. ![]() If a vector diagram (showing the velocity of the cannonball at 1-second intervals of time) is used to represent how the x- and y-components of the velocity of the cannonball is changing with time, then x- and y- velocity vectors could be drawn and their magnitudes labeled. This means that the vertical velocity is changing by 9.8 m/s every second. Yet in actuality, gravity causes the cannonball to accelerate downwards at a rate of 9.8 m/s/s. If there were no gravity, the cannonball would continue in motion at 20 m/s in the horizontal direction. Suppose that the cannonball is launched horizontally with no upward angle whatsoever and with an initial speed of 20 m/s. As you proceed through this part of Lesson 2, pay careful attention to how a conceptual understanding of projectiles translates into a numerical understanding.Ĭonsider again the cannonball launched by a cannon from the top of a very high cliff. You will learn how the numerical values of the x- and y-components of the velocity and displacement change with time (or remain constant). In this portion of Lesson 2 you will learn how to describe the motion of projectiles numerically. The horizontal motion of a projectile is independent of its vertical motion.The vertical velocity of a projectile changes by 9.8 m/s each second,.There is a vertical acceleration caused by gravity its value is 9.8 m/s/s, down,. ![]()
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