Suppose you are driving to school from your home. during the first 15 minutes you drove with an average speed of 40 miles/hour. then you slow down to 20 miles/hour. if you take 30 minutes to reach school then how far is the school from your home.

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