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April 17, 2014

April 17, 2014

Posted by **Alex** on Thursday, October 11, 2012 at 5:55pm.

- Physics -
**Elena**, Thursday, October 11, 2012 at 6:37pms1=v付

s2= v付+a付²/2

180= s1+s2 = v付 +v付+a付²/2=2 v付+a付²/2

a付² +4 v付 -360 = 0

3 t²+72t-360 =0

t²+24t-120 =0

1= -12ｱsqrt(144+120)

t=4.25 s.

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