Two blocks of masses m and `M` are connected by an inextensible light string as shown in the figure. When a constant horizontal force `F` acts on the block of the mass `M`, then tension in the string is : (Assume that constact between the ground and the two blocks are frictionless) and blocks will not topple. (Given: `m = 1 kg, M = 4 kg, F = 10 N, theta = 60^(@)`)