A man wants to climb to the top of a vertical pole height `11 m.` He climbs `5 m` in `2 s`

A man of mass m , standing at the bottom of the staircase of height L climbs it and stands at its top.

A circus artist is climbing a 20 m long rope, which is tightly stretched and tied from the top of a vertical pole to the ground . Find the height of the pole, if the angle and by the rope with ground leave is 30^(@)