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rjstar · 07-01-2003, 04:07 PM

s=ut-0.5at^2
s=40*30+1*900
s=1200+900
s=2100m

v=u+at
0=40+-2t
t=20

So the train travels 2.1km in total but stops after 20 seconds. So the answer is zero, it can go nowhere with it's current accelaration after 30 seconds.

07-01-2003, 04:07 PM
rjstar Confirmed User Join Date: Jul 2002 Posts: 353	s=ut-0.5at^2 s=4030+1900 s=1200+900 s=2100m v=u+at 0=40+-2t t=20 So the train travels 2.1km in total but stops after 20 seconds. So the answer is zero, it can go nowhere with it's current accelaration after 30 seconds.