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Jawabannya:Materi:
Grafik
Pembahasan:
Dik: Vo= 20 cm
a= 10 cm
t= 4 cm
Dit: S ( pda 5 s terakhir )?
Jwb:
S(5 cm)= Vo+a.t+1/2.a.t²
S(5 cm)= 20+10.4+1/2.10.4²
S(5 cm)= 60+5.16
S(5 cm)= 60+80
S(5 cm)= 140 cm. ----- D
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Berdasarkan grafik, gerak tersebut tergolong GLBB diperlambat. Dengan kecepatan akhir = 0 m/s²Diketahui:
vt = 0 m/s
vo = 20 m/s
Kecepatan setelah 4s
vt = vo + at
10 = 20 + 4a
4a = 10 - 20
4a = -10
a = -2,5 m/s²
t = Δv/a
t = (vt - vo)/a
t = (0 - 20)/ -2,5
t = -20/-2,5
t = 8 s
vt = vo + at
vt = 20 + (-2,5)(5)
vt = 20 - 12,5
vt = 7,5 m/s²
Jarak tempuh total setelah 5 detik
s = vo.t + 1/2at²
s = (20)(5) + (1/2)(-2,5)(5)²
s = 100 - 31,25
s = 68,75 m