7. The position of a particle varies in time as r =(3ti + 2t j - 5 k) m. a) Find the expression for the particle velocit
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7. The position of a particle varies in time as r =(3ti + 2t j - 5 k) m. a) Find the expression for the particle velocit
7. The position of a particle varies in time as r =(3ti + 2t j - 5 k) m. a) Find the expression for the particle velocity and acceleration. b) Determine the particle position, velocity and acceleration at time t = 3 s.
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