7.Sa = va. t
Sb = vb. t
Sa + Sb = 300
7. t + 8. t = 300
15.t = 300
t = 300/15 = 20 s
Sa = 7. 20 = 140 m
Sb = 8. 20 = 160 m
Jawaban. A
8.
Kecepatan setelah 1 s
v = vo + gt
v = 0 + 10.1
v = 10 m/s
Energi Mekanik sebelum jatuh dan setelah jatuh 1 s
mgh₁ = mgh₂ + 1/2mv²
gh₁ = gh₂ + 1/2v²
10. 12 = 10.h₂ + 1/2. 100
120 = 10. h₂ + 50
10.h₂ = 70
h₂ = 7 m
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7.Sa = va. t
Sb = vb. t
Sa + Sb = 300
7. t + 8. t = 300
15.t = 300
t = 300/15 = 20 s
Sa = 7. 20 = 140 m
Sb = 8. 20 = 160 m
Jawaban. A
8.
Kecepatan setelah 1 s
v = vo + gt
v = 0 + 10.1
v = 10 m/s
Energi Mekanik sebelum jatuh dan setelah jatuh 1 s
mgh₁ = mgh₂ + 1/2mv²
gh₁ = gh₂ + 1/2v²
10. 12 = 10.h₂ + 1/2. 100
120 = 10. h₂ + 50
10.h₂ = 70
h₂ = 7 m
Jawaban. A