Illustration 24
Why considering the kx not
1/2 kx
Value.
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Answer:
Given:
A mass - spring system has been provided. The mass is lowered slowly and the extension of the spring is asked by 2 students.
To explain:
Why Student A is incorrect and Student B is correct.
Concept:
If you read the question carefully, it has been said that the mass is being
" lowered slowly ".
This refers to the fact that the mass is at equilibrium at all position and is not having any Kinetic Energy.
Hence we can directly apply
mg = kx
Instead of applying
½kx² = mgx.
Hence Student A is incorrect and Student B is correct
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