Question

Pls help, I have a test on this, with explanation.

Answer 1

the answer is B

Step-by-step explanation:

we assume that all of these springs have tha same k , the spring constant

elastic energy for the initial system = Ep1=
`(kd^(2) )/(2)`

for the new changed system , the spring constant = k1+k2 = k+k = 2k , but the displacement is also reduced to 0.5 d

so Ep2 =
`(2k(0.5d)^(2) )/(2) = (kd^2)/(4)`

so the new total Ep stored in the new system is 1/2Ep

hope it helps