A 3.00 kg box sliding west at 2.00 m/s makes an inelastic
collision with a second box sliding
1.50 m/s east. Afterwards, they
both come to a stop. What was
the mass of the second box?
(Unit = kg)
Remember: right is +, left is -

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?