A car of mass 1000kg travelling at 8.0m/s collides with a lorry truck of mass 3000kg that is traveling at 2.0m/s in the same direction. After colliding, the two vehicles stick toy. What is their speed after collision?
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Answer:
By Conservation of Momentum
Total Momentum Before= Total Momentum After
thus
m1v1+m2v2=(m1+m2)v3
Plugging in the numbers and re-arranging for v3 gives
100020+10000=2000*v3
v3=(1000*20)/2000=10m/s
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