A force F produces an acceleration a on an object of mass m. A force 3F is exerted on a second object, and an acceleration 8a results. What is the mass of the second object?  The answer is 3/8 m, but this was a review question but i'm still not 100% sure on why this is the right answer, so could you please explain why this is the right answer and how you found it? thanks!

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!