A 1200 kg car traveling east at 10 m/s, strikes a mailbox and receives an impulse that has a magnitude of 8000 N•s. What is the car’s velocity after this impact?

If the impact happened over 0.5 s, what was the magnitude of the impact force?

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?