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80 = vo.7+1/2a7^2
80 = 7vo+49/2a
80 = 7(vo+7/2a)....1)
vt=vo+at
15=vo+a.7
15=vo+7a
vo=15-7a....2)
substitusi pers 2 ke 1:
80 = 7(15-7a+7/2a)
80 = 7(15-3,5a)
80 = 105-24,5a
24,5a=25
a=25/24,5=1,02m/s^2
vo=15-7.(25/24,5)=15-7,142=7,858m/s