Answer:
33627.4 N/m
Explanation:
By Hook's law F = k x
where F= force applied
K= Spring constant
x= distance it compresses.
Since the force applied in this case will be the weight of the object that causes it to compress, so, the weight will be (175 * 9.8) = 1715N force which causes a compression (x) of 0.0510m.
So,
F = K x
K = F / x
K = 1715 / 0.0510
K = 33627N/m