Posted by Anonymous on Monday, September 30, 2013 at 10:13pm.
The position of a toy locomotive moving on a
straight track along the xaxis is given by the
equation
x = t
4 − 6 t
2 + 9 t ,
where x is in meters and t is in seconds.
The net force on the locomotive is equal to
zero when t is equal to
Answer in units of s

physics  Anonymous, Tuesday, November 26, 2013 at 6:34pm
0.852
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