Two identical spring balances $S_1$ and $S_2$ are connected one after the other and are held vertically as shown in the figure. A mass of 10 kg is hanging from $S_2$. If the readings on $S_1$ and $S_2$ are $W_1$ and $W_2$ respectively, then:

• A

  $W_1=5 \mathrm{~kg}$ and $W_2=10 \mathrm{~kg}$
• B

  $W_1=10 \mathrm{~kg}$ and $W_2=5 \mathrm{~kg}$
• C

  $W_1=5 \mathrm{~kg}$ and $W_2=5 \mathrm{~kg}$
• Correct answer
  D

  $W_1=10 \mathrm{~kg}$ and $W_2=10 \mathrm{~kg}$

Solution

In both end tension will be same. $\mathrm{W}_1=10 \mathrm{~kg}$ and $\mathrm{W}_2=10 \mathrm{~kg}$ So, the reading on $\mathrm{S}_1$ and $\mathrm{S}_2$ are $\mathrm{W} 1=10 \mathrm{~kg}$ and W 2 $=10 \mathrm{~kg}$ respectively.

Hence, the correct answer is option: 'D'.