If an element has 2 naturally occurring isotopes, one with a Mass Number of 10 amu and one with a mass number of 20 amu, explain why the atomic mass of the isotope may not be 15 amu (the average of the 2 numbers).

Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number