a truck of mass 2500 kg moving at 15 m/s collides with a car of mass 1000 kg moving at 5 m/s in the opposite direction .with what velocity would the two move together

Mass of truck(m1) = 2500kg
​Velocity of truck(v1) = 15m/s
Mass of car(m2) = 1000kg
​Velocity of car(v2) = 5m/s
Mass of truck and car(m3) = 2500+1000=3500kg
​By conservation of momentum
m1v1+m2v2=m3v3
​2500*15-1000*5=3500v ('-' sign because it is in the opposite direction)
v=9.28m/s
Hope this will clear your doubt.

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