According to my examination I have confirmed that I do NOT repeat do NOT know this .
On Earth, about 29 grams of mass weigh one ounce
The Earth takes (365 and 1/4) days to orbit the sun. That's the length of our 'year'.
Since it's not really possible to make our calendar a quarter of a day longer every year, we make the calendar a <u><em>whole</em></u> day longer every 4 years.
So "Leap years" make up for the extra one-fourth day the Earth takes to orbit the sun.
Hi I believe it is b. sorry if this isnt found to be helpful.
The average velocity is 20 km/h west
Explanation:
The velocity of an object is given by:

where
d is the displacement
t is the time elapsed
The displacement of an object is a vector connecting the initial position and the final position of motion.
In this problem, the car moved
40 km East
80 km West
Therefore, the displacement is given by (taking West as positive direction)
West
The time elapsed is
t = 2 h
Therefore, the average velocity is
in the West direction.
Learn more about average velocity:
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