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, the controlled variable is kept constant to ensure a fair test. Here, the experiment is about how ball mass affects roll distance. The ramp's height should be constant (controlled) so only mass affects distance. The distance 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