Choose all that apply. which of the following are not considered to be elements essential for life? potassium (k) sodium (na) iron (fe) aluminum (al) silicon (si) magnesium (mg)

aluminum and silicon are not essential for life

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.

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(jacemorris04)