Given is a graph representing the position of a ball as it rolls across a table. what is the ball's average velocity? a) 80 cm/sec b) 20 cm/sec c) 200 cm/sec d) 400 cm/sec

Option C, s = 200 cm/s

Explanation:

The average velocity can be obtained by the slope of the linear function that we have in the graph, this is:

s = (y2 - y1)/(x2 - x1)

where y2 = f(x2) and y1 = f(x1)

for this we need two pairs of data, let's use the first two:

y1 = 20cm, x1 = 0.1 sec

y2 = 40cm, x2 = 0.2 sec.

then the slope is:

s = (40cm - 20cm)/(0.2s - 0.1s) = 20cm/0.1s = 200cm/s

then the correct option is C

probably not if net force is zero

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.