Question

A book that weighs 0.35 kilograms is kept on a shelf that’s 2.0 meters above the ground. A picture frame that weighs 0.5 kilograms will have the same gravitational potential energy as the book when it’s raised to a height of ____

meters.
(Use PE = m × g × h, where g = 9.8 N/kg. )

Answer 1

E p = m · g · h

E p ( book ) = 0.35 kg · 9.8 m/s² · 2 m = 6.86 J

E p ( picture frame ) = 6.86 J

( same gravitational potential energy as the book )

6.86 = 0.5 · 9.8 · h

6.86 = 4.9 h

h = 6.86 : 4.9

h = 1.4 m

Answer: 1.4 M