Answer:
The first case requires more force to spin de bucket.
Explanation:
As we know, the centripetal force is directly proportional to the mass, the equation is given by:

The first case has a quarter more water than the second case, therefore the first case requires more force to spin de bucket.
I hope it helps you!
Answer: 10.36m/s
How? Just divide 200m by 19.3 and you will get how fast he ran per m/s
The working of a spring is given by:
Entering the unknowns, we have:
If you notice any mistake in my english, please let me know, because i am not native.