Question

A book sitting on a shelf has a potential energy of 9800 J and is sitting at a height of 10 m. What is the book's mass?

A. 32,400 kg
B. 80 kg
C. 20 kg
D. 100 kg

Answer 1

The mass of the book can be found using the formula for potential energy: PE = mgh. Plugging in the given values, we find that the mass is approximately 100 kg.

Step-by-step explanation:

To find the mass of the book, we can use the formula for potential energy: PE = mgh, where PE is the potential energy, m is the mass, g is the acceleration due to gravity, and h is the height.

In this case, we are given that the potential energy is 9800 J and the height is 10 m. Plugging in these values into the equation, we get: 9800 J = m * 9.8 m/s² * 10 m.

Simplifying the equation, we find that the mass of the book is approximately 100 kg. Therefore, the correct answer is D. 100 kg.