The initial momentum of the small object is 5 kg*m/s towards the larger object that is at rest. After collision, the small object bounces back with a momentum that has a magnitude or 4 kg*m/s. As the momentum of the object is now reversed it is equal to -4 kg*m/s.

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The initial momentum of the small object is 5 kg*m/s towards the larger object that is at rest. After collision, the small object bounces back with a momentum that has a magnitude or 4 kg*m/s. As the momentum of the object is now reversed it is equal to -4 kg*m/s.

The change in momentum due to the collision is initial momentum - final momentum = 5 - (-4) = 9 kg*m/s

**The magnitude of change of the small object's momentum is 9 kg*m/s.**