Velocity & Acceleration of Ball Thrown Upward: Perpendicular? Parallel?

[jlyu002@ucr.e]

Are there any points along its path at which the velocity and acceleration vectors are perpendicular? Parallel? Also, if a ball is thrown directly upward, wouldn't it fall directly back down?

Homework Equations

The Attempt at a Solution

 

[NascentOxygen]

Was it thrown by a spin bowler? Are there strong winds? Could the throw have taken it to the top of a cliff several hundred feet above the thrower? Must this have occurred on any particular planet? Did the ball encounter something solid in its path, and bounce off it?

 

[jlyu002@ucr.e]

Nope, the question did not specify strong winds, or other planetary properties. I'm going to assume that it wasn't thrown directly upward and that it was thrown at an angle.

 

[jlyu002@ucr.e]

Therefore, with the assumption that I made, correct me if I am wrong, the resultant velocity only allows the vector to be perpendicular at the top of the trajectory and never parallel at any point in time and space.