[单选题]
A spring of negligible
so:e ln ; aps,*+yg0dyf.xzy/mass and
.//pp acy* +bhyz/aumie27unlength of $l_o$ is attached to a fixed point. When the spring is extended by an external force $F$, the length of the spring increases to $l$. The graph shows how the length of the spring varies with the tension in spring. The tension in the spring is equal to where $k$ is a constant $k \Delta l$, and $\Delta l$ is the extension of the spring.
What are
the gradient and
y-intercept of the graph?
