In this same series spring system, what is the

Question

effective combined spring constant kseries of
the two springs?
Answer in units of N/cm.

Answer 1

x=force(1/k1+1/k2)

or force= x kc and kc=1/(1/k1+1/k2)=
kc= k1*k2/(k1+k2)

check that.

Answer 2

could you please explain what to do?? cuz im lost....