Complete the four functions given in template hw$2.$py$.$ The headers of all four functions are

given. The requirements of completing these functions are given in the triple$-$quoted comments

above each function. The following information is needed to complete the coding.

a$)$ Function I & II: cal$\_$secs$\_$ball$\_$falling$1()$ and

cal$\_$secs$\_$ball$\_$falling$2()$

The standard kinematic formula is $=1$

$2$

$2,$ where $=9\mathrm{.}812$ is the acceleration

due to gravity.