As relay runner A enters the 65-ft-long exchange zone with a speed of 30 ft/s, he begins to slow down. He hands the baton to runner B 2.5 s later as they leave the exchange zone with the same velocity. Determine (a) the uniform acceleration of each of the runners, (b) when runner B should begin to ru

a)

b) For this case we can use this formula:

And replacinf for the runner B we got:

And the runner B should begin to run at:

Explanation:

For this case we have the following info given:

represent the initial velocity for runner A

represent the initial velocity for runner B

represent the difference of time between the two runners

represent the total distance for the exchange zone.

Part a

For this case we can use the following formula:

And we can define and we can convert this equation into:

And we can find the acceleration since we have all the other values like this:

And that would be the acceeleration for the runner A.

For the acceleration of the runner A we need to take in count that

And for this case we can use this:

And if we replace we got:

So for this case we have , and we can use this formula:

And solving for a we got:

Part b

For this case we can use this formula:

And replacinf for the runner B we got:

And the runner B should begin to run at:

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!