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Question

A body moving with a kinetic energy of 20 J on a horizontal frictionless surface hits spring whose one end is fixed to a rigid wall and it compresses the spring and it comes to rest. What is the potential energy of spring when it is compressed to the maximum?

A
10 J
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B
20 J
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C
zero
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D
30 J
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Solution

The correct option is B 20 J
Initial Energy of the system 20J
Since there is no friction energy will be conserved
K.E+P.E=Constant
K.Ei+P.Ei=KEf+PEf20J=PEf


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