Jawabanmu

2014-01-11T20:44:58+07:00
[tex] v^{2} = v0^{2} - 2 a . s \\ 0^{2} = 12^{2} - 2 a. 200 \\ 0 = 144 -400a 
\\ -144 = -200a 
 \\ 144 = 200a
a = 0,72 m.s^-2

w = 200 kg . ms^-2
w = 200 N

maaf kalo berbelit belit :)