1. The problem statement, all variables and given/known data A 50.0 gram object, connected to a spring with a force constant of 35.0 N/m oscillates on a horizontal, frictionless surface with an amplitude of 4.00 cm. Find: a) The total energy of the system. b) The speed of the object when the position is 1.00 cm c) The Kinetic Energy and the Potential Energy when the position is 3.00 cm. 2. Relevant equations x(t)=Acos(wt+phi) v(t)=-[wA]sin(wt+phi) E=U+K U=1/2kA^2 K=1/2mv^2 3. The attempt at a solution i guess what i am having trouble with is solving for the kinetic energy in part A. i know that i can substitute the v(t) equation for v but where am i getting the phase constant, or the time components? or can i just ignore them and assume that x=A and therefore K=0 so total energy would be just 1/2kA^2. as for part B my method is that i want to solve for the phase constant in the x(t) equation first and then plug that into my velcity equation but what do i do about the time variable? then using that phase constant i found i am going to find part C. do these methods work? and please advise on part A thanks.