Achild standing on a bus remains still when the bus is at rest. when the bus moves forward and then slows down, the
child continues moving forward at the original speed. this is an example of
a. newton's first law of motion.
b. newton's second law of motion.
c. an action-reaction pair.
d. newton's third law of motion.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)