7. With respect to projectile motion, which of the following statements is true? A. As a projectile is moving up, its velocity decreases and its acceleration increases.
B. As a projectile is moving down, its velocity increases and its acceleration decreases.
C. As a projectile is at the top of its flight, its velocity is at a minimum and its acceleration is at a maximum.
D. As a projectile is moving down, its velocity increases and its acceleration remains the same

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?