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.