Question

If velocity and time are positive in the positive y and x directions of the xy coordinate plane respectively, a velocity versus time graph for an object in free fall is a _______ line with a _______ slope.

Answer 1

In free fall, your velocity is always increasing because the constant acceleration due to gravity although it will be counteracted by drag of air molecules and will increase up to a point - terminal velocity. So it's not going to be a straight line.