College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A 30,000kg mass boxcar sits at rest on a horizontal railroad track. A second car, which has a mass of 90,000kg, moves toward the first at an unknown speed, collides and sticks to the first. The coupled pair then roll toward a spring bumper at the end of the track. The two cars compress the spring 0.96m before coming to rest. If the spring is calibrated to compress 1cm when a 2500N force is applied to it, what was the second car’s initial speed?
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