An electron(mass=9.11×10^-31kg) leaves one end of a discharge tube with zero initial speed and travels in a straight line to the accelerating grid, which is 1.90cm away. It reaches the grid with a speed of 3.00x10^6m/s. If the accelerating force I'd constant compute (a) acceleration (b) the time to reach the grid (c) the ntlet force(ignore the gravitational force on the electron)