Calculate the final velocity for object that hits a second object that is not moving

If an object with a velocity of Xm/s on an air track hits a second object that is not moving (no velocity) and they stick together, and we know that the mass of the second object is 8 times the mass of the first object, how do you calculate the final velocity?

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Denote by M the mass of the first object, then the mass of the second ...

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