(Answered) An object is thrown from the top of a 45m building with an

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An object is thrown from the top of a 45m building with an initial velocity of 20 m/s straight upwards. The ball misses the building on the way down. Using energy considerations.

a. What is the max hight of the ball?

b. What is the velocity of the ball when it is 15m above the ground?

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