1. An airplane with an airspeed of 120 km/h encounters a 90-km/h crosswind. Show that the plane’s groundspeed is 150 km/h. 2. In the orbiting space shuttle, you are handed two identical closed boxes,...

1. An airplane with an airspeed of 120 km/h encounters a 90-km/h crosswind. Show that the plane’s groundspeed is 150 km/h.

2. In the orbiting space shuttle, you are handed two identical closed boxes, one filled with sand and the other filled with feathers. How can you tell which is which without opening the boxes?