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I was standing in a river and I'm curious how much force it was exerting on my leg. I'm not sure how to do this calculation. Here's what I know:

F=ma

if the final velocity is zero, F=mv/t

I'll assuming I was standing in 1ft of water, my leg is 36in^2, and the water is traveling at 4mph.

It doesn't make sense that the force exerted over 2 seconds would be different then the force exerted over 4 seconds.

Any suggestions or help?

Thanks