I think it’s A because it makes the most sense
Answer:
Norma’s average speed is 41.9 km/h.
Explanation:
The average speed is given by:
Where:
: is the total distance
: is the total time
We can find the total distance as follows:
Now, the total time is:
Hence, the average speed is:
Therefore, Norma’s average speed is 41.9 km/h.
I hope it helps you!
<span>A measurement must include both a number and an unit of measurement.
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Hey can u give a little more detail?
Answer:
B= -40
The negative sign indicates the reverse direction to that of vector A.That is it is in the third quadrant.
Explanation:
Th resultant vector is obtained by adding the two vectors A and B
A + B= AB
25 + B= -15
25+ 15= -B
-B = 40
B= -40
Vector B has a magnitude of 40 and points in the opposite direction to that of vector A. The negative indicates the opposite direction.
When we reverse the vector B for adding we place a negative sign with the magnitude.
A vector is quantity defined by magnitude and direction. If the direction is left out it becomes a scalar.