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Kinematika gerak lurus
3
x1 = 4t + 8t² + 6t – 5

3
= 4(0,5) + 8(0,5)² + 6(0,5) – 5

= 4(0,125) + 8(0,25) + 6(0,5) – 5

= 0,5 + 2 + 3 – 5

= 0,5

3
x2 = 4t + 8t² + 6t – 5

3
= 4(2,5) + 8(2,5)² + 6(2,5) – 5

= 4(15,625) + 8(6,25) + 6(2,5) – 5

= 62,5 + 50 + 15 – 5

= 122,5

b) Kecepatan sesaat pada t = 2

2
v = 3(4t ) + 2(8t) + 6

2
v = 12t + 16t + 6

2
v = 12 (2) + 16(2) + 6

v = 48 + 32 + 6

v = 86 m/s

Kecepatan sesaat pada t = 2 s adalah 86 m/s

c) Berapa percepatan rata-ratanya ?

E-Modul SMA/X/Fisika
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