Karate

Is it easier for the person on the left to break a uniform wooden board of length ll, which has a mass mm than to break a uniform wooden board of twice the length 2l2l and twice the mass 2m2m?

Note: Both are equivalent in thickness, density, etc. The person doing the kicking contacts the center of the boards in both cases. Assume that, if the board breaks, it breaks almost immediately after the collision.

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