Aroller coaster has a mass of 650 kg. it sits at the top of a hill with height 78 m. if it drops from this hill, how fast is it going when it reaches the bottom? (assume there is no air resistance or friction.)

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.