Do postcards have any value?and explain

postards have pictures on them, these pictures are things that may never be seen again. the pictures are a part of our history that shows things. because of this many collectors would pay a lot of money for them.

i read on google they "offer a glimpse into the past"

hope this : )

motion can be transfered from one object to another by having an objetct in motion push or hit it

16.) true

17.) true

18.) it doesn't say

19.) true

20.) false

explanation: