An airplane heads due south with an airspeed of 480 km/h. Measurements from the ground indicate the planes ground speed is 528 km/h at south 15 east. Calculate the wind speed and direction. Explain why knowing that someone lives 5 km from the CN Tower is not sufficient to identify their exact position. Mark: 4 Explain why 4 non-collinear distinct points may or may not be coplanar. What about 3 distinct points? Mark: 6 Why is the expression (a x b) x c defined but (a . b) . c is not