12. [-/3 Points] DETAILS KATZPSEF1 9.P.041. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A 4.65-kg wooden block slides 2.40 m down a wooden incline at constant velocity. (The coefficient of static friction is 0.380, and the coefficient of kinetic friction is 0.240.) (a) What is the angle of the incline? . with respect to the horizontal (b) When we are considering energy, why is it useful to include the surface of the incline in the system? O The kinetic friction comes from the incline, so all the thermal energy of the system builds up in the surface. O The thermal energy only builds up in the block, but we need the surface's friction to act on it. O The block pushes on the incline, so we need to consider the kinetic energy of the surface as well as the block. O The kinetic friction causes thermal energy to build up in both the block and the surface. (c) Calculate the increase in the system's thermal energy. J Need Help? Read It Submit Answer View Previous Question Question 12 of 19 View Next