Identify whether the following statements describe a change in acceleration.
a. a car stopped at a stop sign
b. a boat traveling east at 10 miles per hour
c. an airplane traveling north 600 miles per hour
d. a person running at 5 meters/second along a curving path

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.)

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents

What is the relationship between wavelength of light and the quantity of energy per photon?