Answer:
<u><em>A. wavelength</em></u>
Explanation:
The others are about sound and how high it is. That has nothing to do with time.
The measure of the quantity of matter would be mass. Mass is measured in kilograms. I hope this helped!:)
Answer:
d.none
Explanation:
because shape size and physical actually do are dependant
Solve for "x"
X=force
18/6=x/9
cross multiply
162=6x
x=27
Hope this helps
The deceleration experienced by the gymnast is the 9 times of the acceleration due to gravity.
Now from Newton`s first law, the net force on gymnast,

Here, W is the weight of the gymnast and a is the acceleration experienced by the gymnast (
acceleration due to gravity)
Therefore,
OR 
Given
and
Substituting these values in above formula and calculate the force exerted by the gymnast,

