An unknown weight falls through a height of 10mm on a collar rigidly attached to a lower end of a vertical bar 500cm long. If E =200GPa what will be the value of stress?

An unknown weight falls through a height of 10mm on a collar rigidly a

1.	An unknown weight falls through a height of 10mm on a collar rigidly attached to a lower end of a vertical bar 500cm long. If E =200GPa what will be the value of stress?
A.	50 N/mm²
B.	60 N/mm²
C.	70 N/mm²
D.	80 N/mm²
Answer» E.