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A(n) 12000 lb railroad car traveling at 7 ft/s
couples with a stationary car of 7600 lb.
The acceleration of gravity is 32 ft/s2 .
What is their velocity after the collision?
Answer in units of ft/s.

What impulse did the first car receive?
Answer in units of lb s.
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Answer to 6938974
Wt of railroad car=12000lb
Speed=7 ft/sec
Velocity after it gets coupled=12000*7/(12000+7600)
=4.28 ft/sec
Impulse the first car receive=m*v-m*u