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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?

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Which Twin Is Older?

A simplified account of special relativity and the twins paradox.

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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?

Go Spaceship Go

Stage: 5 Challenge Level: Challenge Level:1

Recall that the Power is the rate at which energy is produced, and in this problem the energy is entirely kinetic.