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b) A railroad car of mass 2500 kg travelling at a velocity v = 10m/s is stopped at the end of
the tracks by a spring damper system as shown in the Figure 2. If the stiffness of the spring
is k = 80 kN/m and the damping constant is c = 20 000 N-s/m, propose a solution to ensure
the railroad car do not hit the wall.
C
P
O
Figure 2
a
k/2
0000
O
8⁹
k/2

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