Determine the final velocity of a skateboarder if they start from rest and accelerate at a rate of 75 m/s/s forward for 3 seconds. (Include unit in answer)

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)