A karate player suddenly reduces the speed of his hand while hitting on the ice slab
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beacuse he dosen't want to get hurt.(ask the real question plz)
idk what you mean but the other answer can be that the same force your exert on the slab the same for it will exert on your had(all about newton's 3rd law).so when his hand comes in contact with the slab its speed reduces significantly.
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