Answer:

Explanation:
As we know that ball travels horizontal distance of 24.7 m with uniform speed 49.4 m/s
so we will have



now in the same time ball is turned by angle

now we know that



now the tangential speed of a point at equator is given as



It's probably because there is no gravity which ballpoint pens need for inkflow to the tip.
A reversible change is a change that can be undone or reversed