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A car of mass 1450 kg is constructed on a chassis supported by four springs. Each spring has a force constant of 40000 Nm. The combined mass of the two people occupying the car is 150 kg. What is the period of execution of two complete vibrations?                        

         (a) 0.63 s                         (b) 1.59 s        

         (c) 4.96 s                         (d) 1.26 s

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