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sadaf.10

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A car with a mass of 1400kg is westbound at 50km/h. it collides at an intersection with a northbound truck having a mass of 2000kg and traveling at 40km/h. what is the inital common velocity of the car and truck immediatley after the collision if they have an inelastic collision?

i did all my conversions but i just can't figure out the proper steps in receiving the answer.