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Diket :Massa mobil, m = 600 kg
Kecepatan awal, Vo = 0
Gaya mesin, F = 1500 N
Kecepatan akhir, V = 108 km/jam = 108000/3600 m/s = 30 m/s
Tanya :
A. Percepatan, a = __?
B. Waktu, t = __?
C. Jarak, s = __?
Jawab :
A]
Percepatan,
Gunakan hukum 2 Newton
F = m.a
1500 = 600•a
a = 15/6
a = 2,5 m/s²
B]waktu,
Gunakan rumus GLBB tanpa jarak
V = Vo + a.t
30 = 0 + 2,5•t
30 = 2,5•t
t = 30/2,5
t = 12 sec
C]
Jarak,
Gunakan GLBB tanpa waktu
V² = Vo² + 2.a.s
30² = 0 + 2•2,5•s
900 = 5•s
S = 900/5
S = 180 meter
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FZA