Find the velocity in meters per second of a swimmer who swims 110m toward the shore in 72s

Acube has a volume of 2011 cubic inches. what is the angle measure between a side of a cube and its interior diagonal?

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 energy transformations occur each time the skateboarder rolls up the ramp?