Samuel throws a ball into the air 20 meters. It reaches the top of its flight at 2 seconds and hits the ground at 4 seconds. What was the ball's average speed on the
way down?

Answer the above statement is ( false );

Answerthe force between the charges will be  f/9 (one-ninth of force f)explanationcoulomb's law relates the magnitudes  two point charges q₁ and q₂, the distance, r, between the charges, and the electrostatic force, f, between the two charges:     k represents coulomb's constant, k = 8.99×10⁹ n·m²/c².note that if we have r = 3r, then   

The correct answer is  ait's a process by which rocks and minerals undergo in their composition^o^

From my calculation, i got 3.655moles