A particle of charge = 1μC and mass m = 1 gm starts moving from origin at t = 0 under an electric field of 103 N/C along x-axis and magnetic field of 10 tesla along the same axis with the velocity of vector v = 20j m/sec as shown, the speed of the particle at the time of 20√3 sec will be :
(A) 20 m/sec
(B) 40 m/sec
(C) 10 m/sec
(D) None