An electron is traveling horizontally along the positive x-axis at a speed 3.00 x 106 m/s. After it passes the origin, it enters a constant E field with a strength of 200 N/C and directed 45 degrees up from the x-axis. Starting from the origin, after 15.0 x 10-6 s, how far vertically has it traveled? (Be sure to mention if it is up or down!) Ignore gravity.