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Sagot :
Answer: 0.28 m/s (1 km/hr)
Explanation:
This is an inelastic conservation of momentum question.
First, convert the speed to m/s: 3 km/hr (1000m/1km)(1hr/3600s) = .83 m/s
Then, Momentum before = Momentum after;
Momentum before = m1v1 + m2v2 = 4000(.83) + 8000(0)
Momentum after: (m1 + m2)v3 → (4000 + 8000)v3
Set these equal: 4000(.83) = 12000v3 and solve to get: v3=.28 m/s :)
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