Which of the following do you calculate
when you divide the total distance trav-
eled by the total travel time?

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Which of the the following are examples of projectile motion of both projectile motion and two dimensional motion

Atoms seldom exist as independent particles in nature a) as single particles, most atoms have low potential energy b) their electronegativity is much lower when they combine with other atoms c) atoms are more stable when they combine with other atoms d) neutral particles are rare