In an we experiment when there are two variables we generally find the relation among them by graphing the variables.
The variable which acts irrespective of the other variable is known as the independent variable it is considered as the input. It is plotted on the x axis.
The variable which acts with respect to the other variable is known as the dependent variable it is considered as the output. It is plotted on the y axis.
The answer is A. Force is equal to mass x acceleration. The acceleration due to gravity is a constant so multiplying the mass by 2 would double the force.
I will say that the the potential energy will be at its maximum.
Explanation:
potential energy deals with gravity and gravity deals with height, so when a object is in its maximum height it will have the maximum potential energy.