Answer:
50km /hour
Explanation:
The car moves 100km in two hours.
We can write a ratio like this:
100km : 2hr
Divide both sides by two and you get:
50km : 1hr
Meaning the moving car is moving 50km an hour.
Hope this helps :)
Answer:
It is example of Closed system
Answer:
radiation, then convection
Thumbtacks have a flat top which gives you a bigger area to push on, and the end is tapered and sharp to make it easier to push it into a wall, etc.
In a quarter of an hour it will travel 1/4 x 90 = 22.5Km
