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A ball whooshes down a slide and hits another ball which flies off the slide horizontally as a projectile. How far does it go?

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Escape from Planet Earth

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

Lunar Leaper

Age 16 to 18 Challenge Level:


The strength of gravity on the Moon is about 1/6th that on the Earth. A pole-vaulter around 2 metres tall can clear a bar about 5 metres from the ground on the Earth.

Roughly how high a bar could the pole-vaulter clear on the Moon?