Describe a situation in which work is done. Include the direction of the force and the direction of the displacement of the object. Explain what is gained or lost by the object (kinetic energy or potential energy) and how you know. Either in the same situation or in a new one, show how an object has energy and how that energy allows it to do work.

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