A light string fixed at one end to a clamp on ground passes over a fixed pulley and hangs at the other side. It makes anangle of `30^(@)` with the ground. A monkey if makes an angle of `30^(@)` with the ground. A monkey of mass 5kg climbs up the rope. The clamp can tolerate is vertical force of 40N only. the maximum accelration in upward direction with which the monkey can climb safety is (Neglect friciton and take `g=10m//s^(2)`)