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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 force constant of the spring

A 160 g block is attached to a horizontal spring and executes simple harmonic motion with a period of 0.150 s. If the total energy of the system is 2.50 J. Find the force constant of the spring Find the amplitude of the motion.