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A cement block accidentally falls from rest from the ledge of a 51.7-m-high building. When the...

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Physics

A cement block accidentally falls from rest from the ledge of a51.7-m-high building. When the block is 18.7 m above the ground, aman, 2.00 m tall, looks up and notices that the block is directlyabove him. How much time, at most, does the man have to get out ofthe way? Number Units

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4.2 Ratings (780 Votes)
block starts from 517 m its 187 m when he sees it So what is the velocity at which the block is travelling when he sees it v final velocity u initial velocity s    See Answer
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