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[9 points] 7. A tennis ball is thrown vertically downward from a height of 54 feet with an initial velocity of R feetfsec. a} What

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[9 points] 7. A tennis ball is thrown vertically downward from a height of 54 feet with an initial velocity of R feetfsec. a} What is the velocity ofthe hall at time t'? b} What is the position s{t) of the hall at time t? c} What is the impact velocity if it hits a 15foot tall person on the head

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