A book on a 2 meter high shelf has 20 joules of potential energy. What is the mass of this book?

Question

Allyson Browning

Physics

5 May, 05:29

A book on a 2 meter high shelf has 20 joules of potential energy. What is the mass of this book?

+1

Answers (1)

Know the Answer?

Esmeralda · Answer 1

Potential energy (PE) = Mass (m) * gravitational acceleration (g) * height (h)

PE = 20 J

Height = 2 m

g = 9.8m/s²

mass = (PE) / (g*h)

mass = 20 / (9.8*2)

mass = 1.02 kg