Answer:
A. a parabola with the vertex at (0,0) and a negative value for a
Explanation:
The path of an object thrown with a horizontal velocity from a certain heigth is the path of a projectile, and it is a parabolic path. It is the resultant of two independent motions:
- a horizontal uniform motion, with constant horizontal velocity
- a vertical accelerated motion, with constant acceleration (equal to the gravitational aceleration) towards the ground
Due to the fact that conventionally the positive direction of the vertical axis is taken as upward, the acceleration of the vertical motion is directed downward, so toward negative direction, so the value of a (acceleration) is negative.
