A roller coaster trolley of mass 200 kg rolls from rest at the top of a section of track. This is shown in the figure below. The horizontal section of the track is 5.0 m below the top of the track. The speed of the trolley on the horizontal section was measured to be 8.0 m s"'. 5.0 m 17 What is the gravitational potential energy of the trolley at the top of the track relative to the horizontal section? 18 Calculate the kinetic energy of the trolley on the horizontal section of the track. How much energy was lost to the environment as the trolley moved down the track? 19

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Scalars and Vectors

Scalars and Vectors are the classification of physical quantities that are used to denote various terms in physics.