Question

A 3kg book is resting high on a book shelf. If the book has 73.5 J of potential energy, how high is the shelf?

_____ m

If this book slipped off the shelf and fell all the way to the ground, how much kinetic energy would it have the instant it hit the ground (if we ignore air resistance)?

____

Answer 1

below

Step-by-step explanation:

Potential Energy = mgh

73.5 = 3 kg * 9.81 m/s^2 * h

h = 2.5 m

when the book hits it will have the PE all converted to KE = 73.5 J