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