A runner is training on an oval-shaped track where each lap has a length of 400 meters, the runner maintains a constant speed and completes two laps, returning to the starting point in 100 seconds. What is the velocity of the runner for this time interval?

conservation of mass

mass before something happens = mass afterwards

the given statement is true.

sensory memory lasts for a fraction of seconds before the information is lost. it is the shortest -term memory and can be called as an element of memory. example: when we look at something and remember what it looks like, is just a second of observation. it degrades very quickly. it can also be considered as the process of perception rather than considering it as a memory.