The average speed of a Greyhound bus from Lansing to Detroit is 111.5 km/h. On the return trip from Detroit to Lansing the average speed is 52.2 km/h on the same road due to heavy traffic. What is the average speed of the bus for the round trip

You throw a baseball directly upward at time t = 0 at an initial speed of 12.3 m/s. what is the maximum height the ball reaches above where it leaves your hand? at what times does the ball pass through half the maximum height? ignore air resistance and take g = 9.80 m/s2.

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?