Numbers often have units. We can prepare these numbers for conversion by writing them as fractions.

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.

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.