What am I? Any guesses? A clue is that I am green and made of play-dough.

A big ball of green playdough?

What is your coefficient of restitution ?

Gotta be close to zero if is indeed a big ball of green play-dough? But would depend what's whacking into it I guess?

Some pretend grass made out of play-doh?

Is this philosophy for beginners ? Are we misreading the question ?

I still think its a big green ball of play-dough.

Stu - of course you are correct and you win £5. Congratulations!

Stu, did u get this £5?

Cool, how shall I collect my fiver?

this will require a fourier transform

I'd prefer a Laplace transform...