Assertion: If the positon vector of a particle moving in space is given by `vecr=2thati-4t^(2)hatj

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Assertion: If the positon vector of a particle moving in space is given by `vecr=2thati-4t^(2)hatj`, then the particle moves along a parabolic trajector. Reason: `vecr=xhati+yhatj` and `vecr=2thati-4t^(2)j` `rArr y=-x^(2)`.
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