Aball rolled down a 6 m hill in three seconds. what was the balls speed in m/s2?

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

Salt in oceans comes from and of rocks

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold