This is a really common thing to see happen in the real world, and one that people have a hard time seeing from the point of view of an outside observer just sitting on the side of the road. If you’ve ever been in a truck where this happened to you, now you know why.
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You’ll want to go back to the first part of this section with Newton’s Laws to see where the equations come from and how to use them. This example problem is further down near the end of the section. Try going here first: https://www.sciencelearningspace2.com/2014/10/newtons-first-law-of-motion-2/
can you maybe explain where you get your math equations from? And explain how you got the answers before you move on. Allot of what you talk about doesn’t make sense to me, so if you could explain before you move on i would be grateful. Thanks again.