1. How much work must be done to stop a 1300-kg car traveling at 95 km/h? 2. Spiderman uses his…

1. How much work must be done to stop a
1300-kg car traveling at 95 km/h?

2. Spiderman uses his spider webs to save a
runaway train, Fig. 7-27. His web stretches a few city blocks before the 104-kg
train comes to a stop. Assuming the web acts like a spring, estimate the spring
constant.

FIGURE 7-27