A particle moves 80 cm South in 0.12 seconds and then 60 cm West in 0.08 seconds. What is the magnit ...

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A particle moves 80 cm South in 0.12 seconds and then 60 cm West in 0.08 seconds. What is the magnitude of the average velocity of the particle? A) 700 cm/s  B) 1417 cm/s  C) 500 cm/s  D) 250 cm/s  E) 709 cm/s When a car's speed changes from 20 m/s to 40 m/s, its kinetic energy  A) stays the same  B) is doubled  C) is halved  D) is tripled  E) is quadrupled Vectors u and v have magnitudes of 15 and 7 units respectively. What is the possible highest value of the magnitude of the vector 3u - 2v?  A) 31 units  B) 45 units  C) 66 units  D) 59 units  E) 8 units