A roller coaster descends 50.00 m from the top of the ride, to the first low point at the ground level. The roller coaster converts gravitational potential energy to kinetic energy with an efficiency of 60%. What is the velocity of the roller coaster at the first low point?

100 miles per hour

Today, tubular steel tracks and polyurethane wheels allow coasters to travel over 100 miles per hour (160 km/h), while even taller, faster, and more complex roller coasters continue to be built.

Explanation:

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0.19 m/s and 0.45 m/s