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This is the solution my teacher showed;

The kinetic energy at the momement the hammer hits the nail is

e = mv^2 / 2

= 0.5 (6)^2/2

= 9

W = E = Fs

9 = F(0.01)

F = 900 N

The fact is that i don't quite follow... My idea is to calculate the distance the nail would have covered before it reaches a constant velocity if there was no opposing force, let say s. If s>0.01 (which is obvious), then I would have to calculate the avegage force the nail has and then calculate the deceleration that is caused by the table. Am I right or not, or simply talking about the same thing?