A particle having some charge is projected in $x-y$ plane with a speed of $5\ m/s$ in a region having uniform magnetic field along $z-$ axis. Which of the following cannot be the possible value of velocity at any time ?
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Magnetic field cannot change speed and since magnetic field is along $z$ axis, velocity cannot be in $z$ axis at any instant i.e.. it cannot have $\hat k$ component.
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