What shape does a position vs. time graph have for an object in uniform acceleration?
a. quadratic
b. cubic
c. inverse
d. linear

The correct option is a. quadratic

Explanation:

For an object with uniform acceleration, the equation that modelates the position in function of the time variable is the following :

The function has clearly a quadratic graph because its equation is simmilar to this generic quadratic function :

Whose graph is a quadratic graph.

I added a graph of a classic quadratic function.

a=d/t

a="triangle"v/t

explanation:

a = acceleration

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.