You drop a 2 kg book to a friend who stand on the ground at distance D=10.0 m below, if your friends out streched hand at distance d=1.50 m above the ground. (a) How does the work Wg does the gravitational force do on the book as it is drop to her hands? (b) what is the change U in the gravitational potential energy of book earth system drop? if the gravitational potential energy U of that system is taken be zero by ground level

Question

Giana Raymond

Physics

20 February, 08:44

You drop a 2 kg book to a friend who stand on the ground at distance D=10.0 m below, if your friends out streched hand at distance d=1.50 m above the ground. (a) How does the work Wg does the gravitational force do on the book as it is drop to her hands? (b) what is the change U in the gravitational potential energy of book earth system drop? if the gravitational potential energy U of that system is taken be zero by ground level

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Willow Vincent · Answer 1

Work is defined as force*displacement so total d=8.5m and force will be 2kg*g which is roughly 20N of force so W = 20N*8.5m=170J

For part b the gravitational energy is m*g*h so gravitational energy = 200J since 2kg*10 m/s^2 * 10m so the change since the work is 170 j means total change is 170J and 30J is left