The acceleration due to gravity on the surface of planet x is 19. 6 meters per second2. If an object on the surface of this planet weighs 980 newtons, the mass of the object is.

Which of the following ideas did greek philosopher democritus contribute to the atomic theory? a. each object is made up of one atom, which varies in size from very small to very large. b. matter is composed of only one kind of particle, which can be easily destroyed. c. every element has a specific type of atom, which remains the same size in all forms of matter. d. all matter is composed of small particles, which combine to make larger objects.