Use the formula: Ek = 1/2mv^2
1/2(0.9) * 4^2
0.45 * 16
7.2
%25 percent should be right hope this helps!!!!!!!
The distance and parallax are inversely related. We can find the distance using the following equation:

where d is distance and p is parallax.
We are given the parallax of the comet relative to the moon, and we are looking for the distance to the comet relative to the moon's distance, so wee can plug in the following value:

The distance is 40 times as far away as the moon.
The strong nuclear force holds the nucleus of an atom together.
Somehow, it overcomes the electrical force of repulsion between protons in the nucleus, which all have the same charge but still stay close together somehow. (b)