A force of 10N is required to stretch a spring from 20cm to 25cm. What is the spring constant in N/m2 Be careful of unit

A) 0.005 N/m

B) 0.40 N/m

C) 40 N/m

D) 200 N/m

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A) 0.005 N/m

B) 0.40 N/m

C) 40 N/m

D) 200 N/m

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Answer:C) 40 N/m

Explanation:If we ASSUME that the spring is un-stretched at the zero cm position

k = F/Δx = 10/0.25 = 40 N/m