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Bob has just finished climbing a sheer cliff above a beach, and wants to figure out...

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Physics

Bob has just finished climbing a sheer cliff above a beach, andwants to figure out how high he climbed. All he has to use,however, is a baseball, a stopwatch, and a friend on the beachbelow with a long measuring tape. Bob is a pitcher and he knowsthat the fastest he can throw the ball is about ?0=31.7 m/s. Bobstarts the stopwatch as he throws the ball (with no way to measurethe ball's initial trajectory), and watches carefully. The ballrises and then falls, and after ?1=0.910 s the ball is once againlevel with Bob. Bob cannot see well enough to time when the ballhits the ground. Bob's friend then measures that the ball landed?=128 m from the base of the cliff. How high up is Bob, if the ballstarted exactly 2 m above the edge of the cliff?

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