![Max throw](/sites/default/files/styles/medium/public/thumbnails/content-id-7058-icon.jpg?itok=y7EOEeEl)
![Crazy Cannons](/sites/default/files/styles/medium/public/thumbnails/content-id-7057-icon.png?itok=aD6SSpv0)
problem
Crazy cannons
Two cannons are fired at one another and the cannonballs collide... what can you deduce?
![Placeholder: several colourful numbers](/themes/nrich/images/nrich_small_placeholder.png)
![Angle of shot](/sites/default/files/styles/medium/public/thumbnails/content-id-7361-icon.png?itok=bBaufU6V)
![High Jumping](/sites/default/files/styles/medium/public/thumbnails/content-id-2742-icon.jpg?itok=R6BWE3bA)
article
High jumping
How high can a high jumper jump? How can a high jumper jump higher without jumping higher? Read on...