Reading shown in two extended spring balances, S₁ and S₂ is 60,kg and 30,kg respectively and lif

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4-1.Newton's Laws of Motion

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Reading shown in two extended spring balances, $S_1$ and $S_2$ is $60\,kg$ and $30\,kg$ respectively and lift is accelerating upward with acceleration $10\, m/s^2.$ The mass is stationary with respect to lift. Then the mass of the block will be ......... $kg$.

A

$45$

B

$30$

C

$60$

D

$15$

Solution

$\mathrm{T}_{1}-\mathrm{T}_{2}-\mathrm{mg}=\mathrm{ma}$

$600-300=m(20)$

$\frac{300}{20}=\mathrm{m}$

$m=15\,kg$

Standard 11

Physics

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