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Earlier discussion
1 older comment kept for context.
IME-ATIM ESSIEN
Mass of truck, m¹=500kg
Velocity of truck, v¹=6m/s
Mass of car, m²=100kg
Velocity of car, v²=0m/s
m¹v¹+m²v²=(m¹+m²)V
Where V is the common velocity after collision
(5006)+(1000)=(500+100)V
3000+0=600V
V=\( \cfrac{3000}{600} \)
V=5m/s