Two birds collide in midair. Before the collision, their combined momentum was 35 kg-m/s to the east. What is their combined momentum after the collision? A. 35 kg-m/s down B. 35 kg-m/s east C. 35 kg•m/s north D. 35 kg•m/s west​

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

Energy flows from the producer level to the level. is called