A mass m$=0\mathrm{.}35$kgm$=0\mathrm{.}35$kg is at the end of a horizontal spring on a frictionless horizontal surface. The mass is oscillating with an amplitude A$=4\mathrm{.}5$cmA$=4\mathrm{.}5$cm and a frequency f$=0\mathrm{.}95$Hzf$=0\mathrm{.}95$Hz$.$

$-$ Part $($a$)$

Write an equation for the spring constant kk in terms of the variables in the problem statement $($that is to say, only use the variables and do not concern yourself with the assigned values$).$

kk $=(2$$$f$)2$m$$Correct$!$

$-$ Part $($b$)$

Calculate the spring constant kk$,$ in newtons per meter.

kk $=12\mathrm{.}4712\mathrm{.}47$N$/$mN$/$m$$Correct$!$

$$ Part $($c$)$

Write an equation for the total mechanical energy, EE$,$ of the motion in terms of the variables in the problem statement $($that is to say, only use the variables and do not concern yourself with the assigned values$).$