Physics Practice Problems Work By Variable Forces (Springs) Practice Problems Solution: Spiderman uses his spider webs to save a runaway t...

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Solution: Spiderman uses his spider webs to save a runaway train (see the figure). His web stretches a few city blocks before the 2.5×104 kg train comes to a stop.Assuming the web acts like a spring, estimate the spring constant. Assume the train is moving 25 m/s , and that the distance of "a few city blocks" is perhaps about 850 meters.

Problem

Spiderman uses his spider webs to save a runaway train (see the figure). His web stretches a few city blocks before the 2.5×104 kg train comes to a stop.

Assuming the web acts like a spring, estimate the spring constant. Assume the train is moving 25 m/s , and that the distance of "a few city blocks" is perhaps about 850 meters.