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Physics, 04.03.2021 22:40 ldldunker

If 100 kg Mr Halpin is coasting along to the north and he picks up his 4 kg backpack, what was his velocity before picking up his backpack if he is going 3.5 m/s to the north after picking it up?

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If 100 kg Mr Halpin is coasting along to the north and he picks up his 4 kg backpack, what was his v...
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