In a lab investigation, one group of students (group A) measures the speed of a 0.1 kg toy car to be 2.5 m/s at the bottom of a ramp. Another group of students (group B) measures the speed of the car to be 3 m/s at the bottom of the ramp. The car’s starting position at the top of the ramp is 1 m high. Calculate the kinetic energy of the car for group A

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?