A sled is moving down a steep hill. The mass of the sled is 50kg and the net force acting on it is 20 N. What must be done to find the acceleration of the sled? Check all that apply

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.