A) 0
B) I m/s
C) 2 m/s
D) none
Correct Answer: A
Solution :
[a] \[{{x}_{i}}=\frac{50}{500}=0.l\,m\,{{\ell }_{i}}=0.4-0.1=0.3m\] \[{{x}_{f}} =\sqrt{{{0.4}^{2}}- 0.{{3}^{2}}} -0.3= 0.2m\] \[2\times \frac{1}{2}k{{x}_{i}}^{2}+mg\times 0.3=2\times \frac{1}{2}k{{x}^{2}}_{f}+\frac{1}{2}m{{v}^{2}}\Rightarrow v=0\]
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