Question

A football is thrown in a parabolic path. Tell where the acceleration will be parallel and perpendicular to velocity. @LarsEighner , @SchoolKid , @No.name

Answer 1

http://home.comcast.net/~steve_tech01/Qtr1Files/images/pm_1.jpg

Answer 2

red arrows are velocity
green arrows are acceleration

Answer 3

when they will be parallel.

Answer 4

never

Answer 5

notice that the acceleration is always pointing vertically down.
can the football ever go in that direction in a projectile motion ?

Answer 6

ganeshie8 is right.
In a true parabolic motion, acceleration and velocity are never parallel.