PHYS 6A Lecture 6: Phys6a - Lecture 6
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You toss a ball into the air at an initial angle of 40 . At what point does the ball have the smallest speed? (neglect any effect due to air resistance) Ans: highest point = smallest speed (turning point from going up to going down) Velocity on x axis is the same. Velocity on y axis is going up at point b. Point b is 2x and is 0 at y. Ans: the acceleration is always the same, but non-zero. An object is dropped from an airplane flying at a constant speed in a straight line at a. In this case, the acceleration is the gravity constant altitude. If there is no air resistance, the falling object will . The x direction does not change(remains under plane) but the y does (falling when the plane is still flying straight) Projectile is launched horizontally with speed 75 m/s. 0 = 1. 5m- gt2 30m/g = t2v t = 0. 553.
