A football is thrown upward at some angle above the horizontal. If we neglect air friction, then we can conclude that the acceleration vector of the football is
A) opposite to the velocity vector.
B) zero.
C) along the direction of motion.
D) down.

Question

Quizplus · Accepted Answer

The acceleration of the football is always vertically downwards, due to the force of gravity acting on it. This means that the acceleration vector is in the opposite direction to the velocity vector when the ball is moving upwards, and in the same direction as the velocity vector when the ball is moving downwards.

A Football Is Thrown Upward at Some Angle Above the Horizontal