Are sinkhole fatalities common?

Sinkhole fatalities are rare, but they do occur sometimes. Also fatalities are more likely where sinkholes are common. For example, sinkholes are more  common in Florida than in California, so you would more likely die from a sinkhole in Florida than you would in California.

Hope this helps!

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

probably not if net force is zero