An ideal horizontal spring-mass system oscillates with a period of 0.900 seconds. The mass is 3.00 kg but the spring constant is not known. When this same spring and mass are arranged to hang vertically, the frequency of oscillations will be: a. 0.40 Hz
b. 1.2 Hz
c. 2.5 Hz
d. none of the above are correct

what are the statements? x

there are no correct statementd on the list of choices you provided.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.