Question

how can a Karate player break a slab of ice with a single blow of his hand​

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 orice slabs with a single blow of his hand. He strikes the pile with his handvery fast. Thus the entire momentum of the fast moving hand is reduced tozero in a very short time

Answer 2

By breaking an ice and practising daily.. Jk.. When the hand is blown fast, the momentum increases thus breaking the ice. If the karate player would have hit slow then the ice would not break because of the less momentum