A ball with a mass of 3.20 kg is moving with velocity (6.80î − 2.40ĵ) m/s. (HINT: v2 = v · v.) (a) What is the ball's kinetic energy (in J) at this velocity? J (b) Find the net work (in J) on the ball if its velocity changes to (8.00î + 4.00ĵ) m/s. J
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