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A 10g mass placed on the pan of a spring balance causes an extension of 5cm. If a 15g ...

A 10g mass placed on the pan of a spring balance causes an extension of 5cm. If a 15g mass is placed on the pan of the same spring balance, the extension is
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  • A 3.3cm
  • B 6.5cm
  • C 7.5cm
  • D 10.8cm
  • E 15.0cm
Correct Answer: Option C
Explanation:
F \(\alpha\) e and m \(\alpha\) F
\(\frac{m_1}{e_1}\) = \(\frac{m_2}{e_2}\)
\(\frac{10}{5}\) = \(\frac{15}{e_2}\)
e2 = 7.5cm

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