Force on a Spring II

A spring has a length of 30 cm at rest and it elongates by 2cm for a weight of 20N. The spring retains its perfect elasticity as its length does not exceed 40 cm.
a- Calculate the max mass that can be measured with this spring. Please explain your answer.
b- We suspend a weight of 120 N. Is Hooke's law still applicable? Is the length produced by this weight valid? Explain why?

#Physics

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$