Hello, here is the problem Ive been stuck on. It seems simple but I am getting the wrong answer. Any help would be appreciated. A 20.0-kg rock is sliding on a rough, horizontal surface at 8.00 m/s and eventually stops due to friction. The coefficient of kinetic friction between the rock and the surface is 0.200. What average thermal power is produced as the rock stops? My answers thus far are 784 1040 427 They were all wrong.