Answer:
Option C
Explanation:
Let the potential energy of rock A be represented as Pa
And the potential energy of rock B be represented as Pb
Pa = ma * g * h
Pb = mb * g*h
ma = 2 * mb
Thus, Pa = 2 mb * g*h
Pa/Pb = 2 mb * g*h/mb * g*h
Pa/Pb = 2
Pa = 2 * Pb
The energy pf rock A is two times the energy of rock B.
OR
Pb = Pa/2
Hence, option C is correct
The answer to this question is: Valid
For example, let's say that a researcher wants to study the psychology of motivation as a variable.
In this case, motivation does not possess a measurable standard that could be used as data, so the researcher could only predict thte amount of motivation through the amount of job done (but this data is reliable because motivation is only on of the many factors that may influenced it)
The answer to number 1 is b and the answer to number 2 is c
