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A 5000kg freight car moving at 4 km/hr collides and couples with an 8000kg freight car which is initially at rest.

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in Physics by (70.8k points)

A 5000kg freight car moving at 4 km/hr collides and couples with an 8000kg freight car which is initially at rest. The approximate common final speed of these two cars is 

(A) 1 km/h 

(B) 1.3 km/h 

(C) 1.5 km/h 

(D) 2.5 km/h 

(E) 4 km/h 

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1 Answer

+1 vote
by (65.3k points)

Correct option (C) 1.5 km/h

Perfect inelastic collision. m1v1i = mtot(vf) … (5000)(4) = (13000)vf

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