An electron and a proton are released simultaneously from rest and start moving toward each other due to their electrostatic attraction, with no other forces present. which of the following statements are true just before they are about to collide?
a) they are closer to the to the initial position of the electron that to the initial position of the proton.
b) they are closer to the to the initial position of the proton that to the initial position of the electron.
c) the electrostatic force on the proton is greater than the electrostatic force on the electron.
d) they both have the same speed.
e) they are at the midpoint of their initial separation.

B) They are closer to the to the initial position of the proton that to the initial position of the electron.

Explanation:

As we know that electron and proton both are moving due to mutual electrostatic attraction force

So the force between them is given as

now since it follows Newton's III law so they both will have equal and opposite force on each other

Now the acceleration of the electron and proton is given as

acceleration of proton is given as

since acceleration of electron is much larger than the acceleration of proton

so electron will move more distance hence correct answer will be

B) They are closer to the to the initial position of the proton that to the initial position of the electron.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.