# Problem: A fireman of 80 kg slides down a pole. When he reaches the bottom, 4.2 m below his starting point, his speed is 2.2 m/s. By how much has thermal energy increased during his slide?

###### FREE Expert Solution

Change in thermal energy:

$\overline{)\begin{array}{rcl}\mathbf{∆}\mathbf{T}\mathbf{E}& {\mathbf{=}}& \mathbf{P}\mathbf{E}\mathbf{-}\mathbf{K}\mathbf{E}\\ & {\mathbf{=}}& \mathbf{m}\mathbf{g}\mathbf{h}\mathbf{-}\frac{\mathbf{1}}{\mathbf{2}}\mathbf{m}{\mathbf{v}}^{\mathbf{2}}\end{array}}$

###### Problem Details

A fireman of 80 kg slides down a pole. When he reaches the bottom, 4.2 m below his starting point, his speed is 2.2 m/s.

By how much has thermal energy increased during his slide?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the More Work-Energy Problems concept. You can view video lessons to learn More Work-Energy Problems. Or if you need more More Work-Energy Problems practice, you can also practice More Work-Energy Problems practice problems.