A of mass 5.0 kilograms moving at 20. meters per second collides with ball B of unknown mass moving at 10. meters per second in the same direction. After the collision, ball A moves at 10. meters per second and ball B at 15 meters per second, both still in the same direction. What is the mass of ball B

Mass of B is 10 kg

Explanation:

M1v1a + m2v1b = m1v2a + m2v2b

Let m2 = x

5*20 + x10 = 5*10 + x15

100 + x10 = 50 + x15

50 = x5

X= 10

Mass of B is 10 kg

M1 = mass of A

V1a = initial velocity of A

V2a = final velocity of A

M2 = mass of B

V1b = initial velocity of B

V2b = final velocity of B

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!