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## Homework Statement

A uniform elastic plank moves due to a constant force F distributed uniformly over the end face. The area of the ned face is S and Young's modulus = E . What is the average strain produced in the direction of force ?

## Homework Equations

E*strain=stress....

## The Attempt at a Solution

I am not getting any clue.....how can stress or strain develop unless equal and opposite forces are acting? How ro approach this sum?