Dik : mb = 5 kg, mp = 50 g = 0,05 kg,
vb = 0 m/s, vp = 80 m/s, u = 0,4
Dit :
a. s = ... m , vp' = -10 m/s
b. s = ... m , (mp + mb)
Jwb :
a. step 1
mp vp + mb vb = mp vp' + mb vb'
0,05(80) + 5 (0) = 0,05 (-10) + 5 vb'
4 + 0 = -0,5 + 5 vb'
4 + 0,5 = 5 vb'
4,5 = 5 vb'
vb' = 0,9 m/s
step 2
W = ∆Ek
fg s = 1/2 m(vb'² - vb²)
u m g s = 1/2 m (vb'² - 0²)
s = vb'²/2ug
s = 0,9²/2(0,4)10
s = 0,81/8
s = 0,1012 m = 10.12 cm
b. step 1
mp vp + mb vb = (mp + mb) v'
0,05(80) + 5(0) = (0,05 + 5) v'
4 = (0,05 + 5) v'
v' = 4/5,05
fg s = 1/2 (mb + mp)v'²
u mb g s = 1/2 (mb + mp)v'²
s = (mb + mp)v'²/2 u mb g
s = (5 + 0,05)(4/5,05)²/2(0,4)5(10)
s = (5,05)(4/5,05)²/40
s = 4/5,05(40)
s = 0,1/5,05
s = 0,0198 m = 1,98 cm
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Dik : mb = 5 kg, mp = 50 g = 0,05 kg,
vb = 0 m/s, vp = 80 m/s, u = 0,4
Dit :
a. s = ... m , vp' = -10 m/s
b. s = ... m , (mp + mb)
Jwb :
a. step 1
mp vp + mb vb = mp vp' + mb vb'
0,05(80) + 5 (0) = 0,05 (-10) + 5 vb'
4 + 0 = -0,5 + 5 vb'
4 + 0,5 = 5 vb'
4,5 = 5 vb'
vb' = 0,9 m/s
step 2
W = ∆Ek
fg s = 1/2 m(vb'² - vb²)
u m g s = 1/2 m (vb'² - 0²)
s = vb'²/2ug
s = 0,9²/2(0,4)10
s = 0,81/8
s = 0,1012 m = 10.12 cm
b. step 1
mp vp + mb vb = (mp + mb) v'
0,05(80) + 5(0) = (0,05 + 5) v'
4 = (0,05 + 5) v'
v' = 4/5,05
step 2
W = ∆Ek
fg s = 1/2 (mb + mp)v'²
u mb g s = 1/2 (mb + mp)v'²
s = (mb + mp)v'²/2 u mb g
s = (5 + 0,05)(4/5,05)²/2(0,4)5(10)
s = (5,05)(4/5,05)²/40
s = 4/5,05(40)
s = 0,1/5,05
s = 0,0198 m = 1,98 cm