Hi! Recently I have began to read up on my passion in physics in my spare time. I have encountered an experiment where lasers are used to decrease the speed of sodium atoms. The lasers are a wavelength that the sodium atoms absorb and then proceed to emit a photon. If the atoms are traveling at a speed of 1km/s and the laser decelerates the speed of the atoms by 106m/s2 how long will it take for them to completely come to a stop? It is a simple question that I simply cannot get the right answer out of. I get the answer 1m but later in the text it mentions the stopping distance to approx. 0.5m! What am I missing? Thanks! Edit: Just realised what I did wrong! Don't know how to delete posts!