Momentum Physics Question?

I’m confused on how to start this Physics problem. Please help me and go through the steps with me.
Thank you.

Two trucks collide. One weighed 1500 newton and was traveling 45.0 m/s at 105 degrees. The second weighed 1800 Newton and was traveling 27.5 m/s at 55 degrees. Find the resulting velocity of the trucks if they stuck together on impact

Ok so the first step i did was get the mass which is the force (1500) divided by 9.8 m/s^2 and got 150 kg and did the same to truck #2 and got 180 kg.
Because i know we have to use the mass to find the momentum which is force time velocity.

However after that step what i do?

http://ift.tt/1iTXfZo

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