Question

A train boxcar of mass m and speed 30 m/s hit and joins two stationary cars....

A train boxcar of mass m and speed 30 m/s hit and joins two stationary cars. There is no friction. The boxcars leave the accident scene together at what speed?

A 0 m/s

B. 15m/s

C.30 m/s

D. 10 m/s

E. 5 m/s

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