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# Buffer problem Watch

1. I'm a bit confused on how to solve part d - it seems to me like there's not enough information to do this? Not sure where to begin on that one.

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2. (Original post by goodwinning)
I'm a bit confused on how to solve part d - it seems to me like there's not enough information to do this? Not sure where to begin on that one.

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you've got mass and velocity of the train - which can give you KE
then you can equate the KE of the moving train to the work done by the buffer
3. (Original post by goodwinning)
I'm a bit confused on how to solve part d - it seems to me like there's not enough information to do this? Not sure where to begin on that one.

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The buffers seem to be springs

In which case F = kx (remember that as F = Kyx. But y?)
4. (Original post by Kyx)
The buffers seem to be springs

In which case F = kx (remember that as F = Kyx. But y?)
Be careful what you suppose under exam conditions - the question says the force is constant while the buffers are being compressed, but with a simple spring system obeying Hooke's law the force varies with the amount of compression.
5. (Original post by Kyx)
The buffers seem to be springs

In which case F = kx (remember that as F = Kyx. But y?)
That's what I was stuck on because I initially thought you'd have to use this.

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