A load of 100N falls through a height of 2cm onto a collar rigidly attached to the lower end of a vertical bar 1.5m long and of 105cm² cross- sectional area. The upper end of the vertical bar is fixed. What is the strain energy stored in the vertical bar if E = 200GPa?

A load of 100N falls through a height of 2cm onto a collar rigidly att

1.	A load of 100N falls through a height of 2cm onto a collar rigidly attached to the lower end of a vertical bar 1.5m long and of 105cm² cross- sectional area. The upper end of the vertical bar is fixed. What is the strain energy stored in the vertical bar if E = 200GPa?
A.	2.045 N-m
B.	3.14 N-m
C.	9.4 N-mm
D.	2.14 N-m
Answer» B. 3.14 N-m