일반물리학 1 — Potential Energy and Conservation of Energy: Problem 51

51 In Fig. 8-43, a block of mass $m$ slides down three slides, each from a height $H$. The coefficient of kinetic friction is the same value $\mu_k$ for the slides. In terms of $m, H, \mu_k,$ and $g$, what is the final kinetic energy of the block as it emerges from (a) slide $a$, (b) slide $b$, and (c) slide $c$?