The 19-Mg boxcar A is coasting at 1.9 m/s on the horizontal track when it encounters a 12- Mg tank car B coasting at 0.78 m/s toward it as shown in the figure. If the cars collide and couple together, (Note: 1 Mg = 1000 kg) Va m/s Vb m/s A Determine the average force in kN. between them if the coupling force takes place in 0.7 s.

The 19-Mg boxcar A is coasting at 1.9 m/s on the horizontal track when it encounters a 12- Mg tank car B coasting at 0.78 m/s toward it as shown in the figure. If the cars collide and couple together, (Note: 1 Mg = 1000 kg) Va m/s Vb m/s A Determine the average force in kN. between them if the coupling force takes place in 0.7 s.