Question

A sledder has 600 J of potential energy and 200 J of kinetic energy at one point on a steep hill.a. How much kinetic energy will the sledder have at the bottom of the hill? 0J200J400J600J800J(Assume negligible air resistance and friction.)b. As the sledder goes down the hill and picks up speed, their potential energy will ---------------- and their kinetic energy will ---------------INCREASE DECREASE

Answer 1

a. 800J

b. decrease, increase

Explanation:

a.

Although the energy is divided into kinetic and potential during the process, the energy must be the same at the beginning, during, and at the end, therefore the kinetic energy at the end would be:

`\begin{gathered} E_K=600+200 \\ \\ E_K=800\text{ J} \end{gathered}`

b.

Because the speed increases and as you go down the height decreases, this means that the potential energy decreases while the kinetic energy increases.

Therefore:

As the sledder goes down the hill and picks up speed, their potential energy will decrease and their kinetic energy will increase