Classical Mechanics
# Introduction to Forces

The gravitational acceleration is \( g= 10 \text{ m/s}^2. \)

In the movie *Spiderman 2*, there's a famous minute long scene where Spiderman stops a train. If the initial speed of a five-car, out of control subway train was around the top speed of the NYC subway (27 m/s), and Spiderman stopped the train in exactly one minute, then what is the magnitude of the force in **Newtons** that Spiderman exerted on the train as he stopped it?

**Details and assumptions**

- A standard New York City subway car full of terrified passengers has a mass of roughly 40,000 kg.
- You may assume the acceleration was constant and any other forces are negligible.

Gravitational acceleration is \(g = 10\) m/s\(^{2}\).

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