Berapa yaa bantu dong kak

X = 3t³ – 5t² + 7

t1 = 2 s
x1 = 3(2)³ – 5(2)² + 7
x1 = 3.8 – 5.4 + 7
x1 = 24 – 20 + 7
x1 = 11

t2 = 4s
x2 = 3(4)³ – 5(4)² + 7
x2 = 3.64 – 5.16 + 7
x2 = 192 – 80 + 7
x2 = 119

V = x2 – x1 / t2 – t1
V = 119 – 11 / 4 – 2
V = 108 / 2
V = 54 m/s²

Jadi kecepatan rata-ratanya sebesar 54 m/s²