QUESTION 2 2.1 Two boys, each of mass m, are standing at the back of a flatbed trolley of mass
4 m. The trolley is at rest on a frictionless horizontal surface.
The boys jump off simultaneously at one end of the trolley with a horizontal
velocity of 2 m-s-1. The trolley moves in the opposite direction
2.1.2 Calculate the final velocity of the trolley. [1m-s ']
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Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?