problem
3 out of 3
Planetary Motion
Age
16 to 18
Challenge level
3 out of 3
Time for some astronomy calculations!
problem
2 out of 3
Favourite
Out in Space
Age
16 to 18
Challenge level
2 out of 3
A space craft is ten thousand kilometres from the centre of the Earth moving away at 10 km per second. At what distance will it have half that speed?