Question

A train car has a mass of 10,000 kg and is moving at +3.0 m/s. It strikes an identical train car that is at rest. The train cars combine. What is the magnitude of the final velocity of the combined cars? is it A 0 m/sB 1.5 m/sC 3.0 m/s or D6.0 m/s

Answer 1

Answer:B)1.5 m/s

Explanation:By the law conservation of linear momentum,

m1u1+m2u2=m1v1+m2v2

(where m1=10,000kg,m2=10,000kg

U1=3m/s and u2=0m/s)

Therefore (10000)(3)+(10000)(0)=20000v(because object is combined)

30000=20000v

V=30000/20000

V=3/2=1.5m/s

That's all

Answer 2

Answer:

1.5

Explanation: