Question

A 52,000 kg railroad car is traveling at 1.5m/s when it strikes another 20,000 kg railroad car that is at rest. If the cars lock together, what is the final speed of the two railroad cars? Round to the nearest hundredth.

The direction of the 52,000 kg car is positive.

Answer 1

Answer:

Let mass of railroad car m1 and its velocity be v1 , mass of another railroad car be m1 and its velocity v2.

m1=52000. v1=1.5. m2=20000. v2= 0

m1v1+m2v2= (m1+m2) v

52000×1.5+0= (72000)v

v= 78000/72000

v= 1.08m/s