A mass vibrates on an ideal spring in a horizontal plane as shown in the figure. The total energy of the spring is 100J. Calculate the kinetic energy of the mass at point B?
A
25J
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B
50J
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C
75J
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D
100J
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E
200J
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Solution
The correct option is D 100J The point B is the point of equilibrium. Hence the potential energy at that point would be 12kx2=12k(0)2=0J
Hence the total energy at point B would be the kinetic energy=100J.