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High Jumping

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


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

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:
Why do this problem?
It requires clear thinking about the principles involved to decide what effect the change of gravity will have on the motion.

Key question
What can you say about the velocity of the pole vaulter when he is at the highest point of his vault?