Question

10.
A block of mass m is at the verge of relative motion as
shown in the figure on a horizontal surface. The coefficient
of friction between the mass and the surfaces u. If the mass
is pulled by a force F as shown in figure. The limiting friction
between mass and the surface will be
(A) umg
(B) u(mg - root3/2F)
(C) u (mg - F/2]
(D) u (mg + F/2)​

Answer 1

Answer:

answer in attachment

the answer can also be Fcos theta but that is not in the options given therefore as in the attachment.