The position of a particle is given by r=9ti+6t2 j+8k, where t is in the second and the coefficients have the proper units for r to be in metres. (i) Find velocity v (t) of particle and a(t) acceleration of the particle. (ii) Find the magnitude and direction of v (t) at t=2 s.
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I don't know sorry!!!!!!!!!!!!!!!!!!!!!!
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