What does a negative slope on a distance versus time graph represent?
Constant time
Constant distance
Distance decreasing over time
Distance increasing over time

How is the composition of a meteorite relevant to finding out the composition of earth's core?

Can someone me with questions 15 to 17 plz.

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