Three blocks are connected on a horizontal frictionless table by two light strings, one between m1and m2, another between m2 and m3. The tensions are T1 between m1 and m2 and T2between m2 and m3. if m1= 1 kg , m2= 8 kg, m3= 27 kg and F = 36 N applied on m3, then T2 will be