Newton's laws of motion

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Question

Reading shown in two extended spring balances, S₁ and S₂ is 60 kg and 30 kg respectively and lift is accelerating upward with acceleration 10 m/s². The mass is stationary
with respect to lift. Find the mass of the block in kg.

Moderate

Solution

$\begin{array}{l} T_{1} - T_{2} - m g = m a \\ 600 - 300 = m (20) \\ \frac{300}{20} = m \\ m = 15 kg \end{array}$

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