The two masses are at the ends of the spring. The spring has been compressed by $1\mathrm{.}4$m$.$ When the spring is released, the $2$kg mass travels in a vertical circle. The surfaces the masses are located on are frictionless. Given that the tension in the string at the top of the vertical circle is $9\mathrm{.}8$N$,$ determine the spring constant of the spring.