A roller coaster with a potential energy of 235,200 J sits at the top of a 30 m high hill. What is the mass of the roller coaster? (Formula: PE = mgh)

Rearrange PE = mgh to solve for mass: m = PE ÷ (gh). Substituting the values gives m = 235,200 ÷ (9.8 × 30) = 235,200 ÷ 294 = 800 kg. The roller coaster’s mass is 800 kg, choice A.

AI-written and checked against the verified answer.