hello 4 questions here i was to lazy to type them sooo here are the pictures um if you can't answer them all its cool well I would prefer if you could answer all of them but if you can only answer one its fine because well I can 4answer 0 so your already better than me um anyway thanks for the help

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of