If a kite is flying at a height of $40\sqrt{3}$ meters from the level ground, attached to a string inclined at 60° to the horizontal, then the length of the string is

1. 80 m

2. $60 \sqrt{3}$ m

3. $80\sqrt{3}$ m

4. 120 m.

If the angle of depression of an object from a 75 m high tower is 30°, then the distance of the object from the tower is

1. $25\sqrt{3}$ m

2. $50\sqrt{3}$ m

3. $75\sqrt{3}$ m

4. 150 m

If a pole 6 m high casts shadow $2\sqrt{3}$ m long on the ground, then the sun's elevation is

1. 60°

2. 45°

3. 30°

4. 90°

If the length of the shadow of a tower is $\sqrt{3}$ times that of its height, then the angle of elevation of the sun is

1. 15°

2. 30°

3. 45°

4. 60°