Question

The book is lifted 1.0-meter from the ground and has a potential energy of 4.9-Joule. What is the mass of the book?

Answer 1

$PE=mgh$

PE =potential energy

m=mass

g= gravity $9.8m/s^2$

h=height

$m=\frac{PE}{gh}$

$m=\frac{4.9}{9.8\times1}=0.5kg$