When a bat is broken mid-swing during an MLB game, what is the bigger cause behind the break, the velocity of the pitch, or the force behind the batter’s swing?

Question

When a bat is broken mid-swing during an MLB game, what is the bigger cause behind the break, the velocity of the pitch, or the force behind the batter’s swing?

In: Physics

Answer 1

Bat. Most broken bats have probably been used multiple times and several likely have cracks, however big or microscopic, before finally breaking.