1. The problem statement, all variables and given/known data A team of dogs drags a 114 kg sled 1.92 km over a horizontal surface at a constant speed. The coefficient of friction between the sled and the snow is 0.124. The acceleration of gravity is 9.8 m/s 2 . Find the work done by the dogs. Answer in units of kJ. Find the energy lost due to friction. Answer in units of kJ. 2. Relevant equations I don't know, I think that might be part of my problem 3. The attempt at a solution For the first one, I did 114 x 9.8 x 1.92 x 0.124 to get 265.982976, which was correct but for the second part, I tried to do 114 x 9.8 x 1.92 to get 2145.024, which would be the energy with no friction, right? Then I subtracted the energy with friction from the energy without friction to get 1879.041, but that was wrong. What am I doing wrong? Wouldn't it make sense that you could find energy lost like this? Is there a formula?