Length of ladder is 18m, A Man climbing over it has reached 15 m then the Height still he has to climb is ....... m

An electrician wants to repair an electric connection on a pole of height 9m. He needs to reach 1.8 m below the top of the pole to do repair work. What should be the length of the ladder which he should use, when he climbs it at an angle of 60^(@) with the ground? What will be the distance between foot of the ladder and foot of the pole?

In a ship of length 28 m, height of its mast is 12 m. If the height of the mast in its model is 9 cm what is the length of the model ship?

A ladder of 10 m length touches a wall at a height of 5 m. The angle made by it with the horizontal is

A ladder 15m long just reaches the top of vertical wall. If the ladder makes an angle of 60^@ with the wall. Then the height of the wall is

Amonkey of mass 15kg is climbing on a rope with one end fixed to the ceiling. If it wishes to go up with an acceleration of 1m//s^2 , how much force should it apply to the rope ? If the rope is 5m long and the monkey starts from rest, how much time will it take to reach the ceiling ?