A ball is$$projected at $72.1$ speed from the top of a building. The building is $204$ metres tall. The distance travelled in metres before$$it reaches the ground is$$as follows,

$=0+122$

a$)$ What is the speed of the ball of in $.1?$ b$)$ Find the time for the ball to drop to a sixth $($measured from the ground$)$ of the height of the building.$$