Question

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?

Answer 1

Answer:

Explanation:

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