A light rope fixed at one end to a wooden clamp on the ground passes over a tree branch and hangs on the other side. It makes an angle of 30 with 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 to it. Find the maximum acceleration in the upward direction with which the man can climb safely. Neglect friction at the tree branch . Take g=10
