7. How much potential energy does a 2 kg book have on a 1.5 meter up shelf?

The potential energy (PE) of an object is calculated using the formula:<br /><br />PE = mgh<br /><br />Where:<br /><br />* m = mass (in kg)<br />* g = acceleration due to gravity (approximately 9.8 m/s² on Earth)<br />* h = height (in meters)<br /><br />In this case:<br /><br />* m = 2 kg<br />* g = 9.8 m/s²<br />* h = 1.5 m<br /><br />So, the potential energy of the book is:<br /><br />PE = (2 kg) * (9.8 m/s²) * (1.5 m) = 29.4 Joules<br /><br />Therefore, the book has 29.4 Joules of potential energy.<br />