A ball traveling with an initial momentum of 4.0 kgm/s bounces off a wall and comes back

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A ball traveling with an initial momentum of 4.0 kg·m/s bounces off a wall and comes back in the opposite direction with a momentum of - 3.5 kg·m/s.
a. What is the change in momentum of the ball?
b. What impulse is required to produce this change?

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