Book Problems: Do the following book problems from $3$rd Edition of Physics For Scientists and Engineers

by Randall D$.$ Knight.

$1.($Ch $2$ P $17)$ Ball bearings are made by letting spherical drops of molten metal fall inside a tall tower $$

called a shot tower $$ and solidify as they fall.

a$.$ If a bearing needs $4\mathrm{.}0$ s to solidify enough for impact, how high must the tower be$?$

b$.$ What is the bearing$$s impact velocity?