The spring constant k = 50 N/m
According to Hooke's Law, the restoring force F of a spring is:
F = kx
where k is the spring constant and x is the displacement after stretch.
Given that x = 60 cm = 0.6 m and F = 3 N
then, k = F/x = 3/0.6 N/m
k = 50 N/m is the spring constant
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