I think it’s a because it the only reasonable answer
It slows down. The molecules/particles aren't as close together, resulting in slower movement.
In order to change from 45 m/s up to 9 m/s down, the velocity
of the ball has to change by (45+9)= 54 m/s downward.
Gravity adds 9.8 m/s of downward speed to any falling object
every second.
So the change takes (54/9.8) = 5.5 seconds .
As always,. F = M A.
Centripetal acceleration = V-squared / R. So F=M V-squared/R. =. 85 x 225 / 20. = 956.25 Newton's (about 215 pounds). That's the force required to keep that mass moving at that speed around that circle. If the force is less, or not there, then the 85 kg moves slower, or leaves that path.
