Jawabanmu

2014-09-11T18:07:59+07:00
T ( 4 ) - t ( 2 )
= 119-11
= 108 m/s

t = 4 sekon
3(4)³ - 5(4)² + 7
= 192 - 80 + 7
119

t = 2 sekon
3(2)³ - 5(2)² + 7
= 24 - 20 + 7
= 11


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