The weight of an empty railway wagon is 235.35 kN. On loading it with goods weighing 313.8 kN, its
spring gets compressed by 8 cm.
a) Calculate its natural period of vibration when
1) Empty
Loaded as above
b) It is set into natural vibration with amplitude of 10 cm when empty. Calculate the velocity
when its displacement is 4 cm from the statical equilibrium position
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