Editor
The total energy of a pendulum is $\rm{50 \,\,J}$. What will be its kinetic energy at the mean position·?
Difficulty: Easy
A: 
\rm{0 \,\,J}
B: 
\rm{25 \,\,J}
C: 
\rm{50 \,\,J}
D: 
None of these
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