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A particle of specific charge alpha star...

A particle of specific charge `alpha` starts moving from (0,0,0) under the action of electric field `E = chati` and magnetic field `vecB = B_(0)hatk`. Its velocity at (x, 0, 0) is `4hati + 3hatj`. Find the value of x

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`1/2mv^(2)=vecF.vecS,1/2m(25)=q(vecE.vecS)`
`25/2=alpha(ehati.xhati),exalpha=25/2x=25/(2alphae)`
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