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Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

An experimental procedure requires a 10 ml of acid to be dissolved

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?