The diagram above represents the graph of the force F applied in stretching a spiral spring against the corresponding extension (X). The force constant of the spring is?
Attached Figure / Diagram
A
20 Nm-1
B
40 Nm-1
C
30 Nm-1
D
10 Nm-1
Verified Correct Answer: A.
Physical Principles & Numerical Solution
F = Ke (Hooke's law)
K = F/e = 80/4
= 20 Nm-1
Source: WAEC / JAMB / NECO Classroom Archive (Record #14502)