You drop a 2.90 kg book to a friend who stands on the ground at distance D = 13.0 m below. Your friend's outstretched hands are at distance d = 1.70 m above the ground (see the figure). (a) What is the speed of the book when it reaches her hands? (b) If we substituted a second book with twice the mass, what would its speed be when it reaches her hands? (c) If, instead, the book were thrown down with initial speed 4.10 m/s, what would be the answer to (a)?

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