A soccer ball is traveling at a velocity of 50 m/s. The kinetic energy of the ball is 500 J. What is the mass of the soccer ball? (Formula: ) 0.1 kg
0.2 kg
0.4 kg
0.5 kg

500=1/2*m*50^2

500=1/2*m*2500

500=m*1250

m=500/1250

m=0.4 kg

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.