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23 October, 22:51

A roller coaster with people on board has a total mass of 4500 kg and starts at a height of 22 meters with a speed of 2.0 m/s. 50 kJ of work is done by friction on the way to the bottom of the ride. What is the speed at the bottom of the ride?

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  1. 23 October, 23:09
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    Energy at the bottom

    = 1/2 mu² + mgh - work done by friction

    = 1/2 x 4500 x 2² + 4500 x 9.8 x 22 - 50000

    = 9000+970200 - 50000

    = 929200 J

    1/2 m V² = 929200

    V = 20.32 m / s
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