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# M5 motion with variable mass help! Watch

1. Here's the question (6b) and what I've done. How do I get m+100 on the bottom?

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2. Here is the question if you are struggling to read it from the first picture!

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3. (Original post by Jooooshy)
Here is the question if you are struggling to read it from the first picture!

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I could read the question fine, but I can't make out anything in your solution apart from the last 2 lines.
4. Where is the + 100 coming from on the denominator? Thanks again for your help

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5. (Original post by Jooooshy)
...
F=ma, and what's the total mass?
6. Okay I'm just going to go and cry now

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