A 1.50 kg mass is placed on the end of a spring that has aspring constant of 175 N/m. The mass-spring system rests on africtionless incline that is at an angle of 30 degrees from thehorizontal. The system is eased into its equilibrium position,where it stays. a) Determine the change in elastic potential energyof the system. b) Determine the system's change in gravitationalpotential energy.
-In the first part, why do you use sin? instead of cos?, oradd cos and sin together? Why is just mgsin?=kx for both part a andb?
-And in part b, it is asking for the gravitational force. Whywouldn't you use PE=mgy?
