A cave diver enters a long underwater tunnel, when her displacement with respect to the entry point is 20m, she accidentally drops her camera but she doesn't notice it missing until she is some 6m farther into the tunnel. She swims back 10m but cannot find the camera, so she decides to end the dive. How far from the entry point is she?Taking the positive direction out of the tunnel, what is her displacement vector relative to the entry point?

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