A rock dropped on the moon will increase its speed from 0 m/s (its starting speed when it first dropped) to 4.9 m/s in about 3 seconds what value do calculate for the the magnitude of the acceleration of the gravity of the moon

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc