A mass is attached to a spring and undergoes simple harmonic motion characterized by a period, an amplitude, and a maximum speed $($achieved as the mass passes through the equilibrium point$).$ At the moment in time when the spring is at its maximum amplitude and the mass is momentarily at rest, a piece of clay falls on the mass and sticks, effectively increasing the net mass.

As a result, the period of the oscillation $[$ Select $]["$remains the same", "decreases", "increases"$],$

while the amplitude of the oscillation $[$ Select $]["$decreases$",$ "increases", "remains the same"$]$

and the maximum speed$[$ Select $]["$increases$",$ "remains the same", "decreases"$].$