Which of the following is an example of speed?

a truck driving 15 miles per hour south

a cat running 5 meters per minute

a bicyclist ridding 12 miles per hour east

a plane traveling at 15 miles

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

the area between the graph and the t axis