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The position of a particle is given by ...

The position of a particle is given by ` vec r= 3.0 t hat i - 2.0 t^2 hat j + 4.0 hat k m`, wher (t) in seconds and the coefficients have the proper units for ` vec r` to be in metres. what is the magnitude of the velocity of particle at t=2 sec ?

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The correct Answer is:
(a) `7i+2j`; (b) 12.30 p.m. (c) `9//2i+j`
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