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Broad Topics > Calculus > First order differential equations

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Out in Space

Age 16 to 18 Challenge Level:

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?

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It's Only a Minus Sign

Age 16 to 18 Challenge Level:

Solve these differential equations to see how a minus sign can change the answer