Question: Spiderman uses his spider webs to save a runaway train moving about 60km/h Fig. 6-44. His web stretches a few city blocks (500 m) before

Spiderman uses his spider webs to save a runaway train moving about 60km/h Fig. 6-44. His web stretches a few city blocks (500 m) before the 104 -kg train comes to a stop. Assuming the web acts like a spring, estimate the effective spring constant.

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