4-21. A boat moves diagonally across a river at a heading of 60 south of east...

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4-21. A boat moves diagonally across a river at a heading of 60 south of east at a speed of V = 8 mph. The river flows due west at a speed of V = 3 mph. The resulting vector diagram for resultant velocity VR of the boat is shown in Fig. P4.21. y, mph N W E S x, mph 60 Vb VR Vw Figure P4.21 Resultant velocity of boat crossing a river. a. Determine the resultant velocity V of the boat, which is given by V = V + V, in both rectangular and polar forms. b. Repeat part (a) using the laws of sines and cosines. 4-21. A boat moves diagonally across a river at a heading of 60 south of east at a speed of V = 8 mph. The river flows due west at a speed of V = 3 mph. The resulting vector diagram for resultant velocity VR of the boat is shown in Fig. P4.21. y, mph N W E S x, mph 60 Vb VR Vw Figure P4.21 Resultant velocity of boat crossing a river. a. Determine the resultant velocity V of the boat, which is given by V = V + V, in both rectangular and polar forms. b. Repeat part (a) using the laws of sines and cosines.