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A cement block accidentally falls from rest from the ledge of a 52.1-m-high building. When the block is 19.8 m above the ground, a man, 2.00 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have to get out of the way?

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    A locomotive is accelerating at 3.10 m/s2. It passes through a 25.0-m-wide crossing in a time of 3.03 s. After the locomotive leaves the crossing, how much time is required until its speed reaches 25.7 m/s?

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