Part 1 A tennis ball is dropped from 1.29 m above the ground . It rebounds to a height of 0.839 m. With what velocity does it hit the ground ? The acceleration of gravity is 1.8 m/s ^ 2 . (Let down be negative .) Answer in units of m/s Part 2 With what velocity does it leave the ground ? Answer in units of m/s
Part 3 If the tennis ball were in contact with the ground for 0.0133 s. find the acceleratio given to the tennis ball by the ground . Answer in units of m/s^ 2

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?