I think I understand, but where do you find force?

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Laura0901 said:
I got one by using v=at
Well what did you get?
 
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Which I think is definitely wrong! I don't see how to use acceleration in the equation F=Mmg..
 
Laura0901 said:
I used F=ma so: F=(10,000kg)(1)= 10,000
Why is that wrong? (Except of course you left the units off.) 10,000 N

Now use you "friction" equation: Ff = μN = μmg.
 
Laura0901 said:
10,000 N is the force?
That's the force required to stop a 10,000kg train in 30 seconds if it was traveling at 30 m/sec. Friction is the force that's employed to stop the train.
 
Laura0901 said:
which equaled to .1020408163
That seems reasonable.

In the future, try to use the "reply" feature to respond to a particular post.
 
Wait no I'm not. Well thank you SO MUCH for helping. You're amazing. Thanks for staying around and helping me even though I didn't understand at all
 
Do you mind checking out my other question about checking my answers? If not it's okay.
 
They deleted my question! Ugh! But it is okay. I got help from my teacher lol thanks anyways! :)