A vehicle is powered by a linear induction motor with a pole pitch of 2m. The primary circuit resistance R1 is 0.5Ω, and the secondary resistance referred to the primary circuit is 1.0Ω. The equivalent inductance of the primary plus secondary circuits is 0.02 H. The frequency of the primary windings is 10Hz. Assume that the drag force is 500 N and the friction force is 2kN. Compute the voltage across the primary windings when the motor travels at 100km/h.