Guys plz help me in this Q its really hard

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

How would you reduce the volume of gas

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?