average velocity homework # 3.doc - 6E The average velocity...

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6E The average velocity is the total displacement divided by the time interval. The total displacement r is the sum of 3 displacements, each calculated as the product of a velocity and a time interval. The _rst has a magnitude of (60:0 km/h)(40:0 min)=(60:0 min/h) = 40:0 km. Its direction is east. If we take the x axis to be toward the east and the y axis to be toward the north, then this displacement is r 1 = (40:0 i) km. The second has a magnitude of (60:0 km/h)(20:0 min)=(60:0 min/h) = 20:0 km. Its direction is 50:0 _ east of north, so it may be written r 2 = (20:0 sin 50:0 _ i + 20:0 cos 50:0 _ j)km = (15:3 i + 12:9 j) km. The third has a magnitude of (60:0 km/h)(50:0 min)=(60:0 min/h) = 50:0 km. Its direction is west, so the displacement may be written r
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