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# Work and Spring Displacement

CLMECH-18UVOD

To stretch a spring by $8\space cm$ from its unstretched position, you need to do $20\space J$ of work. How much work do you need to do to stretch it by $4\space cm$ from its unstretched position?

A

$10\space J$

B

$40 \space J$

C

$5 \space J$

D

We need to know the mass of the spring to answer.