Upon examining layer m, you find that it contains a small proportion of the radioactive isotope - potassium-40, which decays into argon-40 with a half-life of 1.3 billion years. assuming no contamination, what would be the age of a this layer if it contained 25% of potassium-40 and 75% argon-40?

t = 2.6 billion years

Explanation:

If potassium becomes 25% of its initial value

so we can say it becomes half two times

as we know that 25% means it is 1/4 times of initial value

so we will have

here we know that

t = 2.6 billion years

we're given that v₀ = 0 and a = 5.4 m/s². therefore, since v = at + v₀ for constant acceleration the equation for velocity is

after 28s,

m/s

which i would round to 150 m/s as my final answer