## Returning ball (kinematics)

Hello!

Can someone help me define the necessary condition in which the ball returns back to the thrower?

a,b and c are angles.

The changeable value can be either a,b or V0, irrelevant.

I don't know if there is a condition concerning the angle b, should it be 90°?

In that case if a=0 the ball would just continue jumping at the spot where it hits the ground.

(the dotted line should represent the parabolic flight, haven't figured out jet how to draw that nicely :) )
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 Blog Entries: 27 Recognitions: Gold Member Homework Help Science Advisor hello pinsky! the ball doesn't have to follow the same path to return to the thrower anyway, what is the coefficient of restitution (the amount of energy lost ono the bounce)? or is it completely elastic?
 Hello tim The ball is completely elastic. I now see that i forgot to mention, i'm looking for the condition in which the ball returns in one bounce. (lets say that a and v0 are constants) I suppose one could also define a relation between the number of bounces and the angle b , me not being the one :) .

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