Which of the following is not a correct chemical equation for a double displacement reaction? (d? )

2hno3 + mg(oh)2 yields 2h2o + mg(no3)2

h3po4 + 3naf yields 3hf + na3po4

2kno2 + baso4 yields k2so4 + ba(no2)2

4nabr + co(so3)2 yields br2so3 + cona4

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)