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You drop a 1.50 kg book to a friend who stands on the ground at distance D = 10.0 m below. Your friend's outstretched hands are at distance d = 1.60 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 6.80 m/s, what would be the answer to (a)? (a) Number Units (b) Number Units (c) Number Units

A single conservative force F = (5.0x - 12) N, where xis in meters, acts on a particle moving along an x axis. The potential energy U associated with this force is assigned a value of 26 J at x = 0. (a) What is the maximum positive potential energy? At what (b) negative value and (c) positive value of x is the potential energy equal to zero? (a) Number Units (b) Number Units (c) Number Units