Which describes how chemical changes are different from physical changes? (2 points)

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2.

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?

Which statements did both aristotle and ptolemy assume? check all that apply.