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Back to 7.2 Kinetic Energy and the Work-Energy Theorem

7.2 Exercise 21

Avg difficulty 2.5

A car’s bumper is designed to withstand a 4.0-km/h (1.12-m/s) collision with an immovable object without damage to the body of the car. The bumper cushions the shock by absorbing the force over a distance. Calculate the magnitude of the average force on a bumper that collapses 0.200 m while bringing a 900-kg car to rest from an initial speed of 1.12 m/s.

OpenStax College Physics 2e, 7.2 Kinetic Energy and the Work-Energy Theorem, exercise 21

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.