9 . A pilot wants to fly west. If the plane has an airspeed of 95 m/s and there is a 25 m/s wind blowing north: A In what direction must she head the plane? (15.3. S of W) B. What will be her speed relative to the ground? (91.7 m/s) C. How far will the plane go In 2.25 h? (743 km west) 10. A 70 m wide river flows at 0.80 m/s. A girl swims across it at 1.4 m/s relative to the water. (a) What is the least time she requires to cross the river? (50 s) (b) How far downstream will she be when she lands on the opposite shore? (40 m) (c) At what angle to the shore would she have to aim, in order to arrive at a point directly opposite the starting point? (55) (d) How long would the trip in part (c) take? (61 s)