What will be the instantaneous stress produced in a bar 10cm² in area ans 4m long by the sudden application of tensile load of unknown magnitude, if the extension of the bar due to suddenly applied load is 1.35mm if E = 2×10⁵ N/mm²?

What will be the instantaneous stress produced in a bar 10cm² in area

1.	What will be the instantaneous stress produced in a bar 10cm² in area ans 4m long by the sudden application of tensile load of unknown magnitude, if the extension of the bar due to suddenly applied load is 1.35mm if E = 2×10⁵ N/mm²?
A.	67.5 N/mm²
B.	47 N/mm²
C.	55.4 N/mm²
D.	78.5 N/mm²
Answer» B. 47 N/mm²