When the block is set into oscillation with amplitude A $,$ it passes through its equilibrium point with a speed v $.$ In which of the following cases will the block, when oscillating with amplitude A $,$ also have speed $\backslash ($ v $\backslash )$ when it passes through its equilibrium point?

I. The block is hung from only one of the two springs.

II$.$ The block is hung from the same two springs but the springs are connected in series rather than in parallel.

III. A $0\mathrm{.}5$ kilogram mass is attached to the block.

I, II and III

I and II only

None

II and III only

III only