Answer to Question #178277 in Physics for Jaida

Question #178277

A roller coaster starts from rest at the top of a 20-m (point A) hill as shown in the diagram. Find the velocity of the roller coaster at point B using the principle of conservation of mechanical energy.

Expert's answer

"0.5mv^2=mgh\\\\v^2=2gh\\\\v^2=2(9.8)(20)\\\\v=19.8\\frac{m}{s}"

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