A) 60 J
B) 10 J
C) 40 J
D) 45 J
E) zero
Correct Answer: D
Solution :
\[E=\frac{1}{2}m{{\omega }^{2}}{{a}^{2}}=80\,J\] ?.. (1) \[\therefore \] \[U=\frac{1}{2}m{{\omega }^{2}}{{y}^{2}}=\frac{1}{2}m{{\omega }^{2}}{{\left( \frac{3a}{4} \right)}^{2}}\] \[=\frac{9}{16}\times 80=45\,J\]
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