\magnification=\magstep2


$$
E_{tot} = {{1}\over{2}} m v^2 + {{1}\over{2}} k y^2  + C
$$

$$
E_{tot} = {{1}\over{2}} m v^2 + {{1}\over{2}} k y^2  
$$

$$
KE = {{1}\over{2}} m v^2  \qquad  U = {{1}\over{2}} k y^2  
$$

$$
E = E_0 e^{-t/\tau} 
$$

\bye
