PLEASE help can't answer my little sister's question

[sayurixaiba]

PLEASE help can't answer my little sister's question!

She ask me IF I can give a situations where you can observe the objects accelerating/decelerating free fall bodies and objects that traveled at trajectory path

I AM SO ANGRY cause can't answer her question :(((((((

PLEASE HELP ME~~~~~~
-thanks

 

[chrisbaird]

For the good of the community (and the poster), the OP is here translated into English:

She asks me if I can give situations where you can observe objects accelerating/decelerating as free fall bodies and objects that travel a trajectory path.

I am rather frustrated because I can't answer her question.
Please help me.
Thanks

 

[chrisbaird]

I good place to start studying free fall and trajectories is with tennis balls in a field. Have someone throw the ball with different initial forces, and different initial angles and observe the trajectories. The ball follows a parabolic trajectory because the acceleration due to gravity is constant.

 

[256bits]

The moon!

 

[Drakkith]

Roll a tennis ball off of a ramp into midair. Right when it hits the end, drop another one straight down from equal height. You can do this by hand or set up a neat little contraption to do everything exactly on time.