Find the frequency of vibration of a ball of mass m = 3 kg on a spring of modulus (i) k1 = 27 nt/m, (ii) k2 = 75 nt/m, (iii) on these springs in parallel (see Fig. 40), (iv) in series, that is, the ball hangs on one springs, which in turn hangs on the otherspring.

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