Three blocks of masses \[{{m}_{1}},{{m}_{2}}\] and \[{{m}_{3}}\] are connected by massless strings as shown on a frictionless table. They are pulled with a force of 40N. If\[{{m}_{1}}=10kg\], \[{{m}_{2}}=6kg\] and \[{{m}_{3}}=4kg\], then tension \[{{T}_{2}}\] will be: