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Free-fall notion 1. A ball is thrown vertically upward at an initial speed of 49 m/s. Assume that the ball leaves the hand when it is 15 m above the ground (about the height of Kirkbride), and that the effects of air resistance can be ignored. Choose your landmark to be the ground; then at t -0, yo- +15 m, Vyo +49 m/s a. 5 pts) How fast is the launch speed in mph? Do you think this is a realistic possibility? b. (10 pts) What is the maximum height (in m) above the ground attained by the ball? c. (10 pts) How much time does it take to reach a height that is one-half of the maximum height above the ground (i.e., at y +68.75 m)? (Think about the motion, using some helpful visualization. There are two answers - distinguish between them.) [ Answer: t 1.25 s, 8.75 s ] d. (10 pts) Determine the impact velocity of the ball (the balls velocity just as it reaches the ground), in m/s. [ Note: the answer is nof zero, but is negative. I
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