Question

Why does a karate player break a slab of ice with a single blow? physics ​

Answer 1

This decreases the force with which he lands on the bed. Similarly, a karate player is able to break a pile of tiles or ice slabs with asingle blow of his hand. He strikes the pile with his hand very fast. Thus the entire momentum of the fast moving hand isreduced to zero in a very short time.
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Answer 2

because low surface area of hand more pressure it exerts