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9. A 1.25 kg rock is thrown with a velocity of 12.5 m/s straight up. (a) How much kinetic energy does it have when it

9. A 1.25 kg rock is thrown with a velocity of 12.5 m/s straight up. (a) How much kinetic energy does it have when it is initially released? (b) What is its kinetic energy at the highest point in its trajectory? (c) How high does it go(What did all the kinetic energy turn to at the top?)? (d) What is the potential energy at the highest point? (answers: a) 98 J b) ??? c) 7.97 m d) 98 J)

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