Reading shown in two spring balances \( S_{1} \) and \( S_{2} \) is \( 90 \mathrm{~kg} \) and \(...

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Reading shown in two spring balances \( S_{1} \) and \( S_{2} \) is \( 90 \mathrm{~kg} \) and \( 30 \mathrm{~kg} \) respectively when lift is accelerating upwards with acceleration \( 10 \mathrm{~m} / \mathrm{s}^{2} \). The mass is stationary with respect to lift. Then the mass of the block will be:
(a) \( 60 \mathrm{~kg} \)
(b) \( 30 \mathrm{~kg} \)
(c) \( 120 \mathrm{~kg} \)
(d) None of these
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