Si ambas personas realizan MRU, calcula el tiempo de alcance. Tener en cuenta que al inicio están separados 300 m, además quien está delante lo hace con 54 km/h y el otro va con 72 km/h. Ojo pasar los datos al sistema internacional, obvio​

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