18. y = Vo sin 37.t - 1/2 .gt²
10 = Vo.3/5.t - 1/2.10.t²
50 = 3.Vo.t - 25.t² ....(1)
x = Vo.cos 37. t
20 = Vo.4/5.t
Vo.t = 100/4 = 25 .......(2)
masukkan (2) ke (1)
50 = 75 - 25.t²
25.t² = 25
t = 1
masukkan t ke (2)
Vo.t = 25
Vo .1 = 25
Vo = 25 m/s
Jawab. c
29.
Di titik tertinggi Vy = 0
Vy = Vo.sin A - g.t
0 = Vo.sin A - 10t
t = Vo.sin A/10
Ketinggian di titik tertinggi
y = Vosin A.t - 1/2.g.t²
y = Vo.sin A.Vo.sin A/10 - 1/2.10.Vo².sin² A/100
y = 1/2.Vo².sin² A/10
y = Vo².sin² A/20
y1 : y2 = 16 : 25
Vo1².sin² A/20 : Vo2².sin² A/20 = 16 : 25
Vo1² : Vo2² = 16 : 25
Vo1 : Vo2 = 4 : 5
Jawaban. d
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18. y = Vo sin 37.t - 1/2 .gt²
10 = Vo.3/5.t - 1/2.10.t²
50 = 3.Vo.t - 25.t² ....(1)
x = Vo.cos 37. t
20 = Vo.4/5.t
Vo.t = 100/4 = 25 .......(2)
masukkan (2) ke (1)
50 = 75 - 25.t²
25.t² = 25
t = 1
masukkan t ke (2)
Vo.t = 25
Vo .1 = 25
Vo = 25 m/s
Jawab. c
29.
Di titik tertinggi Vy = 0
Vy = Vo.sin A - g.t
0 = Vo.sin A - 10t
t = Vo.sin A/10
Ketinggian di titik tertinggi
y = Vosin A.t - 1/2.g.t²
y = Vo.sin A.Vo.sin A/10 - 1/2.10.Vo².sin² A/100
y = 1/2.Vo².sin² A/10
y = Vo².sin² A/20
y1 : y2 = 16 : 25
Vo1².sin² A/20 : Vo2².sin² A/20 = 16 : 25
Vo1² : Vo2² = 16 : 25
Vo1 : Vo2 = 4 : 5
Jawaban. d