Acar travels 100 meters in 4.0 seconds. find its average velocity.

What is the measure of a change in an objects velocity?

Hydrogen and helium are both members of?

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?