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)

What create a global village and the emergence of a new international popular culture

What does separation of church and state mean?

Why might countries with command economies have high rates of employment? the government offers career counseling. command economies have large populations. government planners assign everyone a task. everyone works hard in a command economy.