What is the mass of the truck - collision, Physics

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A 985-kg car travelling south at 29.0 m/s hits a truck travelling  18.0 m/s west, as shown in the figure below.

After the collision, the vehicles stick together and travel with a final momentum of 40 x 104 kg.m/s at an angle of 45°.

What is the mass of the truck?

 

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