A member of the football team jumps straight up and their center of mass has a speed of 2.88 m/s as they leave the field. How high above this point is their center of mass at the following times? (Enter your answers in m. Ignore the effects of air resistance, and assume the initial height of their center of mass is at y = 0.)

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.