7. In a football game, the running back is running up the field. He starts from rest and runs for 3 seconds with an acceleration of 2.5 m/s². What was the magnitude of his displacement?
a. 3.75 m
b. 11.25 m
C. 14.25 m
d. 22.5 m

11.25m

Explanation:

Given parameters:

Initial velocity  = 0m/s

Time of running  = 3s

Acceleration  = 2.5m/s²

Unknown:

Displacement = ?

Solution:

To solve this problem, we apply one of the motion equations.

  S  = ut + at²

   u is the initial velocity

    t is the time taken

    a is the acceleration

 S = (0 x 3)  + (  x 2.5 x 3²)   = 11.25m

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.