Question

your teacher set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. what is the controlled variable? height of the ramp distance traveled by the ball mass of the ball

Explanation:

In an experiment, a controlled variable is kept constant to ensure a fair test. Here, the experiment is about how ball mass affects roll distance. The height of the ramp must be controlled (kept same) so it doesn't influence the distance. The distance traveled is the dependent variable, and mass is the independent variable. So the controlled variable is the height of the ramp.

Answer:

A. Height of the ramp