Which pair of elements has the most similar properties? C. Be and Ba
D. Li and Be
B. Na and Ca
A. H and Mg

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

the answer is barium and copper bromide

explanation:

0.07 g/cm³

1.37 g/cm³