Acar accelerates from 45m/s to 0 m/s in 10 seconds what is the average acceleration of the car

What is the coefficient of kinetic friction μk between the block and the tabletop?

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?

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