Asked by bob

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
Answered by scott
push off from your backpack as hard and fast as you can, towards the shore

you and your backpack will gain equal amounts of momentum

you will slide to solid ground and your backpack will end up on the opposite shore
Answered by Anonymous
throw the backpack
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