A 200,000 kg railroad car moving at 5.14 m/s couples up (sticks together) with another 150,000 kg car at rest. What is the final speed of the two cars? [Write answer to 3 sig. figs.]
using conservation of momentum
m1 v1 + m2 v2 = ( m1 + m2) v
2* 5.14 + 0 = ( 1.5 + 2) v
v = 2.943 m/s
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