Atomic Mass Unit is the answer
Answer:
Explanation:
Given
Car speed decreases at a constant rate from 64 mi/h to 30 mi/h
in 3 sec


we know acceleration is given by 


negative indicates that it is stopping the car
Distance traveled



s=63.038 m
My guess would be about 10 years because stars are hot balls of light that are reflections from years ago so it would most likely take awhile
The answer is 15.0N its explained in newtons third law hope this helps:)