When a spring is stretched by a distance x it exerts a force, given by F = (-5x - 16x^{3})\, N. The work done, when the spring is stretched from 0.1 \,m to 0.2m isa. 8.7×10 −2J
b. 12.2×10 −2J
c. 8.7×10 −1J
d. 12.2×10 −1 J