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I am a total newbe to electronics and I need help fast!! 
I have a project coming up which is to design and build a circuit that detects a high velocity object.  Once detected it needs to then operates a DC motor for one second then shut off.  As I am a total newbe to electronics I am stuck. Oh and it needs to be battery powered, (the motor is only a small).
I figure I could use a motion detector to start the cycle but how it all works I am lost.  Also is a motion detector going to be able to detect a high velocity object?
I am still going through the projects section to see if there is anything there that could help.  If anyone has any ideas or circuit diagrams of this type of circuit I would be very grateful
Thanks
Emma

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