7. A projectile is shot from the edge of a cliff 170 m above ground with an initial speed of 75.0 m/s at an angle of 320 below the horizontal. How much time does it take the projectile to hit the ground? seconds 8. The captain of a small plane starts his journey by proceeding west. The speed of the plane with respect to still air is 180 km/h. A sudden south wind starts to blow at a constant speed of 77.0 km/h. What is the speed of the plane relative to the ground if no action is taken by the pilot? km/h 9. b) As seen by people on the ground, what is the angle made between the direction of motion of the plane with repect to the west