### Lunar Leaper

Gravity on the Moon is about 1/6th that on the Earth. A pole-vaulter 2 metres tall can clear a 5 metres pole on the Earth. How high a pole could he clear on the Moon?

### High Jumping

How high can a high jumper jump? How can a high jumper jump higher without jumping higher? Read on...

### Escape from Planet Earth

How fast would you have to throw a ball upwards so that it would never land?

# Whoosh

##### Stage: 5 Challenge Level:

A ball $A$ of mass $2m$ is at the top of a frictionless chute at height $5h$ above the ground and another ball $B$ of mass $m$ is at rest on the horizontal surface at the end of the chute at height $h$ above the ground. Ball $A$ starts to slide from rest down the chute and hits ball $B$ which is projected, after the impact, off the end of the chute. If the coefficient of restitution between the balls is $0.5$, how far does ball $B$ go horizontally before it hits the ground?