[ Physics ] Open Question : need help with physics.?
A train is traveling down a straight track at 20 m/s when the engineer applies the brakes, resulting in an acceleration of -1.0m/s^2 as long as the train is in motion. How far does the train move during a 39s time interval starting at the instant the brakes are applied?
[ Mathematics ] Open Question : 10x^4-7x^2+1=0 solve?
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