100 poin (50) Plus Jawaban Terbaik bagi yang tahu.Tugas sekolah pls
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11.
F. 2 = 20. 1 + 10. 2...(gbr kurang jelas angka massanya )
F = 40/2 = 20 N
12.
a.
F. 4 = m.g. 2
F. 4 = 2. 10. 2
F = 10 N
b.
F. 4 = 2. 10. 3 + 5. 10. 2
F = 160/4 = 40 N
13.
a.
F. 3 = 10. 10. 1 .. gambar kurang jelas diambil m= 10 kg
F = 100/3 = 33,3 N
b.
KM = Lk/Lb = 3/1 = 3
14.
a. Waktu
a = F/m = 100/50 = 2 m/s²
v = v₀ - at
0 = 20 - 2. t
t = 20/2 = 10 s
b. Usaha
s = v₀.t - 1/2.at²
s = 20. 10 - 1/2. 2. 100
s = 100 m
W = - F.s
W = - 100. 100
W = - 10000 J ..., negatif krn gaya berlawanan dgn arah gerak
15.
a. Percepatan
a = F/m = 20/4 = 5 m/s²
v = v₀ + at
v = 5 + 5. 5
v = 30 m/s
b. Usaha
W = 1/2. m.(v²- v₀²)
W = 1/2. 4.( 900 - 25)
W = 1750 J