Answer: 0.497 J
Step-by-step explanation:
Spring energy
Spring energy is stored in a compressible or stretchable object like a spring or rubber band.
The work done on a spring in changing its original length is converted to its elastic potential energy or spring energy.
Given -
The spring constant is k = 20N/m,
The initial stretch is x1 = 0.16m,
The additional stretch is x2 = 0.063m,
W = 0.5k (x1 + x2)^2 - 0.5k x1^2
W = 0.5 (20 N/m) (0.16m + 0.063m)^2
W = 0.497 J