How high will a ball go if it is thrown UP with an an initial velocity of 7 m/s?

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.)

What occurs during a combustion reaction

As you lift an 88 n box straight upward you produce a power of 72 w. what is the speed of the box?