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Fearofphysics: Physics problem of the week

Physics Problem of the Week for Oct 20 2014

Car on bumpy road

Four people get into a 2000 kg car. They then start driving down a bumpy road, that has bumps every 6 m. Each person has a mass of 75 kg. The car bounces on its suspension as they drive over the bumps. The bouncing gets really large (in fact, the largest) when the car goes 20 km/hr over the bumps. By how much does the car rise on its suspension when the people get out of the car again?

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