Indicate whether the following statements are true or false. Assume that air resistance is negligible. The speed of the ball was greatest at point Y0 when it was still in contact with the spring. The speed of the ball was decreasing on its way from point Y0 to point Ytop. The speed of the ball was zero at point Ytop. The speed of the ball was the same for all points in its motion between points Y0 and Ytop.

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.