Consider again the general equation describing oscillating position, x$($t$)=$Asin$($t$+)$x$($t$)=$Asin$($t$+)$with initial conditions x$(0)=$x$0$x$(0)=$x$0$and v$(0)=$v$0$v$(0)=$v$0.$ The oscillating object has mass mm$.$ Find the kinetic energy of the mass when the spring is stretched halfway between equilibrium and its maximum stretched distance. Note: The velocity given below is in meters$/$second$,$ despite the problem statement saying $\text{'}$m$\text{'}$ only.

x$0=0$ m

v$0=6\mathrm{.}7$ m

m $=3\mathrm{.}6$ kg

Find KEhalf stretch $[$J$]=$