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You drop a 1.8 kg textbook to a friend who stands on the ground 9 m below the textbook with outstretched hands 1.50 m above the ground.
(a) What is the speed of the textbook when it reaches the hands?
(b) If we substituted a second textbook with twice the mass, what would its speed be?
(c) If, instead, the textbook were thrown down, would the answer to (a) increase, decrease, or remain the same?

I will be happy to critique your thinking on this.

What did Galelo prove at Pisa?

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