![Comet catastrophe](/sites/default/files/styles/medium/public/thumbnails/content-id-7055-icon.jpg?itok=vstwNpdH)
![Whoosh](/sites/default/files/styles/medium/public/thumbnails/content-id-4755-icon.jpg?itok=tJ70iV7F)
problem
Favourite
Whoosh
A ball whooshes down a slide and hits another ball which flies off
the slide horizontally as a projectile. How far does it go?
![Placeholder: several colourful numbers](/themes/nrich/images/nrich_small_placeholder.png)
![Cannon Balls](/sites/default/files/styles/medium/public/thumbnails/content-id-5987-icon.jpg?itok=E3utd-mw)
![Placeholder: several colourful numbers](/themes/nrich/images/nrich_small_placeholder.png)
problem
Collision with a vertical spring
Coefficients of restitution meet springs in this bouncy problem