Answer:
a baseball flying through the air at 90 miles per hour
Step-by-step explanation:
As we know that kinetic energy is given as

so it depends on two factors
1) mass of object
2) speed of the object
so here for maximum kinetic energy we need to choose the one which will have maximum speed in all given options
So here we can say that maximum kinetic energy is given as
a baseball flying through the air at 90 miles per hour
as it is the maximum speed in all given options