Please show work for #3. thank you.

The answer is frictional force

So since the snail is moving at 3.6  miles per hour you multiply by 5280 to change it into feet per hour. so you get 36*528 ft per hour. since there are 3600 seconds in an hour, you divide 36*528 by 3600. so simplifying we get 528/100 which is 5.28 ft per second

Carbon dioxide because it consists of one type of molecule.

Answer is  true.  because the sensory memory it can also have a fraction of a second before the information is lost. hope it .