When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in momentum of the baseball?

The ball’s change in momentum is its final momentum minus its initial momentum. If it comes to rest, its final momentum is zero, so the change is the same whether the glove moves backward or not, as long as the ball’s initial speed is unchanged. The glove’s backward motion increases the stopping time and reduces the force, but it does not change the ball’s total change in momentum.

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