i am confused on how to solve these problems..thanks(adsbygoogle = window.adsbygoogle || []).push({});

You drop a 1.80 kg textbook to a friend who stands on the ground 10.0 m below the textbook with outstretched hands 1.50 m above the ground

(d) If the gravitational potential energy of that system is zero at ground level, what is its potential energy U when the textbook reaches the hands?

(e) How much work Wg is done on the textbook by its weight as it drops to your friend's hands if U is 100 J at the ground level.

(f) What is the change U in the gravitational potential energy of the textbook-Earth system during the drop if U is 100 J at the ground level.

(h) Find U at the hands when U is 100 J at the ground level.

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# Homework Help: Potential Energy and Work

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