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Standard IX

Physics

Weight and Mass

Reading shown...

Question

Reading shown in two spring balances $S_{1}$ and $S_{2}$ is 90 kg and 30 kg respectively when lift is accelerating upwards with acceleration 10 m/s $^{2}$ . The mass is stationary with respect to lift. Then the mass of the block will be:

60 kg

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30 kg

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120 kg

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None of these

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Solution

The correct option is A 60 kg
REF.Image
$T_{1} + T_{2} = m g + m a$
$m (g + a) = (T_{1} + T_{2}) 10$
$m \times 20 = 120 \times 10$
$m = 60 k g$

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Reading shown in two spring balances S1 and S2 is 90 kg and 30 kg respectively when lift is accelerating upwards with acceleration 10 m/s2. The mass is stationary with respect to lift. Then the mass of the block will be:

The correct option is A 60 kgREF.ImageT1+T2=mg+mam(g+a)=(T1+T2)10m×20=120×10m=60kg

Reading shown in two spring balances $S_{1}$ and $S_{2}$ is 90 kg and 30 kg respectively when lift is accelerating upwards with acceleration 10 m/s $^{2}$ . The mass is stationary with respect to lift. Then the mass of the block will be:

The correct option is A 60 kg
REF.Image
$T_{1} + T_{2} = m g + m a$
$m (g + a) = (T_{1} + T_{2}) 10$
$m \times 20 = 120 \times 10$
$m = 60 k g$