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/sWhen 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 quadrupledVectors 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
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