Question

A hiker, of mass 80kg, walks up a mountain, 600m above sea level, to spend the night at the top in the first overnight camp. The second day she walks to the second overnight camp, 400m above sea level. The third day she returns to her starting point, 200m above sea level. What is the potential energy of the hiker at the third camp (relative to sea level)?

Answer 1

Ans : PE = 156800 J

Explanation:

Mass of the hiker , m = 80 kg

Hight of the third camp , h = 200 m

Now , the potential energy , PE = mgh

$PE = 80\text{ kg}\times9.8\text{ m/s}^2\times200\text{ m}=156800\text{ J}$ Potential energy of the hiker at the third camp is 156800 J.