Question

Illustration 24
Why considering the kx not
1/2 kx
Value.

Answer 1

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