What caused the change in the fireballs velocity as it traveled

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

Are oil and water a mixture or solution