2. A 0.012 kg stone is thrown upward at 35 m/s. (a) What is the work done by the force of gravity in bringing the stone to rest at its highest position? (b) What
distance does the force of gravity require to bring the stone to rest?

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