Question

Find the work done by friction.

Refer the Figure​

Answer 1

$hey \: mate \\ \\ this \: can \: be \: solved \: by \: work \: energy \: theorem \: easily \\ \\ wg + wn + wf = \frac{1}{2} m {v}^{2} - \frac{1}{2} m {u}^{2} \\ mgh + 0 + wf = \frac{1}{2} m {v}^{2} - 0 \\ 2 \times 10 \times 25 + wf = \frac{1}{2} \times 2 \times {20}^{2} \\ 500 + wf = 400 \\ wf = - 100j$

Answer 2

Explanation:

Answer refer in Attachment

Thank you