Which of the following means an object is speeding up? a. it's velocity is decreasing b. it's velocity is increasing c. it's acceleration is increasing d. it's acceleration is decreasing

If an object is speeding up, then we say it HAS acceleration, and its velocity is increasing.

C) 1/8 of the radius of earth. Why? Well, the closer you get to the core of the earth, the stronger the gravitational field (acceleration due to gravity) is. Why? Because of Newton’s law of Gravitation:
Fg = GMm/r^2; as r decreases, Fg increases, and so does g.

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