as per hooke's law
F = kx
83/ x = k.. (i)
Considering energy conservation
0.5 k x^2 = 0.5 m v^2
83 / x * x^2 = 1.82* 1.2^2
x = 0.0316 m
putting in (i)
k = 2630 N/m
=======
Comment in case any doubt, will reply for sure . Goodluck
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