What property does soil or rock need to be permeable? a.)young b.)old c.)non porous d.)porosity

Porosity

Explanation:

Something that is permeable allows liquid or air to pass through it

Non Porous means doesn't allow liquid or air to pass through it, porosity is the opposite of this and allows liquid or air to pass through it.

ek = (m·v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) ·v2/2

ek = (200 + 250) ·2,32/2 = 450·5,29/2 = 1190,25 j