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A particle of mass 'm' is moving in time...

A particle of mass 'm' is moving in time 't' on a trajectory given by
`vec(r)=10alphat^(2)hat(i)+5beta(t-5)hat(j)`
Where `alpha` and `beta` are dimensional constants.
The angular momentum of the particle becomes the same as it was for t = 0 at time t = ________ seconds.

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