Answer:
The change in momentum increases because the impact time increases.
Step-by-step explanation:
The change in momentum of an object is also called impulse (J), and it is equal to

where
F is the force applied to the object
is the time taken for the change in momentum of the object to occur (the impact time)
From the formula above, we can notice that:
- the larger the force, the larger the change in momentum
- the larger the impact time, the larger the change in momentum
In the example of the baseball caught by the glove, when the glove moves backward, the time taken for the ball to stop increases (due to the movement of the gloves). Looking at the formula, we see that this means that the impulse (the change in momentum) increases.