1. The problem statement, all variables and given/known data We have an object whose mass is 0.7 kg moves with an equation y=0.45cos8.4t. Find the general energy w=8.4 A=0.45 2. Relevant equations E=mv^2/2 +kA^2/2 3. The attempt at a solution So I found k using w=(k/m)^0.5. And then I found V0 using V0=A*(k/m)^0.5 and then i found x using F=kx Then I found V=V0*(1-x^2/A^2)^0.5 And then I used E=kA^2/2+mv^2/2 IS THIS RIGHT?