Which of the following statements describes newton's second law? a. objects remain in the same state of motion unless a force acts on them. b. for every action force there is an equal and opposite reaction force. c. the force of friction on an object is proportional to the normal force. d. net force is equal to mass times acceleration.

Which branches of natural science include the study of an organism that lived 10 million years ago

The mantle is made up of which structural zones?

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.