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What is the height of the power line

To find the height of an overhead power line, you throw a ball straight upward. The ball passes the line on the way up after 0.85 s, and passes it again on the way down 1.4 s after it was tossed.

(a) What is the height of the power line?

(b) What is the initial speed of the ball?

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## Q : Find the horizontal component of the book''s velocity

A physics book slides off a horizontal table top with a speed of 1.45 . It strikes the floor after a time of 0.440 . Ignore air resistance.Find the horizontal component of the book's velocity just before the book reaches the floor.