Answer:
<h2>10 m/s</h2>
Explanation:
Her average speed can be found by using the formula

d is the distance
t is the time taken
From the question we have

We have the final answer as
<h3>10 m/s</h3>
Hope this helps you
Explanation:
there are 8 atoms of hydrogen
Explanation:
it's one mole because the atomic mass is treated as molar mass and the atomic mass of strontium is 87.62 grams/mol
It is a elastic wave made by an earthquake or other means