Potential energy,

$\overline{){\mathbf{U}}{\mathbf{=}}{\mathbf{m}}{\mathbf{g}}{\mathbf{h}}}$

Work done,

$\overline{){\mathbf{W}}{\mathbf{=}}{\mathit{F}}{\mathit{d}}}$

A)

m = 1.7 kg

g = 9.8 m/s^{2}

Δh = h_{f} - h_{i} = 2.3 m - 0.80 m = 1.5 m

A 1.7 kg book is lying on a 0.80 m -high table. You pick it up and place it on a bookshelf 2.3 m above the floor.

A) During this process, how much work does gravity do on the book?

B) During this process, how much work does your hand do on the book?