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9. (40) A velocity vector for an object is given by 7(t) - 621 + 54{j. Please find: a) The speed at t=2s, b) The

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9. (40) A velocity vector for an object is given by 7(t) - 621 + 54{j. Please find: a) The speed at t=2s, b) The displacement of the object between t=0s and t=2s, c) Its position at t=2s if it had an initial position of 7(0) = 5mi - 3mj. d) The acceleration at t=5s

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