Selective breeding. That is, breeding which uses extreme selectivity
B. the distance the star is from Earth
Explanation:
The apparent magnitude of star is a function of its distance from the earth. It is one of the physical properties that is used to study a star.
The apparent magnitude of a star or other astronomical bodies is a measure of their brightness as seen from a location on the earth.
The apparent magnitude of a star depends on:
- Distance of the star from the location on earth.
- luminosity of the star
- the particles along the part of the star and earth that cuts off the light the earth receives.
learn more:
Star luminosity brainly.com/question/9084808
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Answer:
Explanation:
For this problem, we just need to remember conservation of momentum, as there are no external forces in the horizontal direction:
where the suffix i means initial, and the suffix f means final.
The initial momentum will be:
as the second puck is initially at rest:
Using the unit vector 
pointing in the original line of motion:
So:
Knowing the magnitude and directions relative to the x axis, we can find Cartesian representation of the vectors using the formula
So, our velocity vectors will be:
We got
So, we got the equations:
and
.
From the last one, we get:
and, for the first one:
so:
and
I got B,when you subtract 3/5 from NEGATIVE 2/3 it creates a negative 19 over a positive 15.
