What do you mean by the speed of car is 40 km per hour

It means that the car is covering 40 kilometer per hour

Explanation:

its c i just checked it

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.