What would happen eventually to a balloon sitting in a sunny window? which gas predicts this?

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.)

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero