A light rope fixed t one end of a wooden clamp on the ground passes over a tree branch and hangs on the other side. It mamkes an angle of `30^0` wilth the ground. A man weighing (60 kg) wants to climb up the rope.The wooden clamp can come out of the ground if an upward force greater than 360 N is applied it. Find the maximu acceleration in the upward direction with which the man can clim,b safely. Neglect friction at the tree branch. Take `g=10 m/s^2`