Answer:
Slope= 
Explanation:
We are supposed to find the slope in a position time graph,
For that we need atleast two points 
.(
represents there coordinates in respective axis directions.)
In the given case the y axis would be the position and the x axis as time .
Slope is defined as the ratio of change in y coordinate to change in x coordinate :- 
So subsituting the coordinates of position and time we get slope as:-
[When we have more than two points which are not collinear then to calculate the slope we take the average.]
It is very important that all scientists use the metric system because it is universal - America is the only country that doesn't use the metric system, whereas in the rest of the world, metric system is used. So as not to confuse numbers and do something incorrectly, it is better to use metric system instead.
B. It reflects a lot of light, transmits almost no light, and absorbs some light.
Answer:
Check attachment for your answer
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