Final answer:
The responding variable in Joaquin's experiment is the speed of the ball is decides which type of ball to use (Option A).
Step-by-step explanation:
The responding variable in an experiment is also known as the dependent variable. It is the aspect of the experiment that is observed and expected to change as a result of the manipulation of the independent variable.
In the context of the experiment described, where Joaquin wants to know how the slope of a ramp affects the speed of the ball when it reaches the end of the ramp, the speed of the ball would be the responding variable because it is what is being measured in response to the changes in the angle of the ramp.
When Joaquin is designing his experiment to test how the slope affects the ball's speed, the step where Joaquin uses his imagination is when he identifies the variables in the experiment. This creative process involves deciding on which type of ball to use, the angle of the ramp, and how to accurately record the results.
Among the options provided, deciding which type of ball to use (Option A) would likely require the most imagination and creativity, as Joaquin would have to consider different shapes, sizes, and materials to select the most suitable ball for his experiment.
Thus, the correct option is A.
Your question is incomplete but most probably your full question was Joaquin is doing an experiment with a ramp and a ball. He wants to know how the slope of a ramp will affect the speed of the ball when it reaches the end of the ramp.
What is the responding variable in this experiment?
A. Decide which type of ball to use.
B. Measure the angle between the ramp and the floor.
C. Accurately record the results in a data table.
D. Identify the variables in the experiment.