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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 : Effective coefficient of kinetic friction between wheel-wet

A potter's wheel having a radius 0.53 m and a moment of inertia 14.8 kg·m2 is rotating freely at 52 rev/min. The potter can stop the wheel in 6.0 s by pressing a wet rag against the rim and exerting a radially inward force of 65 N. Find the