Menentukan arah. Misal:
(+) jika ke kanan
(-) jika ke kiri
mₕ = 400 kg
vₕ = 8 m/s
mₖ = 500 kg
vₖ = -10 m/s
lenting sempurna → e = 1
Ditanyakan: v'ₕ dan v'ₖ
Penyelesaian:
Hukum kekekalan momentum:
Kelentingan:
Eliminasi
4v'ₕ+5v'ₖ = -18 [×1]
-v'ₕ+v'ₖ = 18 [×4]
.
4v'ₕ+5v'ₖ = -18
-4v'ₕ+4v'ₖ = 72
________________ +
9v'ₖ = 54
v'ₖ = 6 m/s
[v'ₖ = (+) → arahnya ke kanan]
Subtitusi v'ₖ = 6 ke (2)
-v'ₕ+v'ₖ = 18
-v'ₕ+6 = 18
-v'ₕ = 12
v'ₕ = -12 m/s
[v'ₕ = (-) → arahnya ke kiri]
Jawaban: B
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Menentukan arah. Misal:
(+) jika ke kanan
(-) jika ke kiri
mₕ = 400 kg
vₕ = 8 m/s
mₖ = 500 kg
vₖ = -10 m/s
lenting sempurna → e = 1
Ditanyakan: v'ₕ dan v'ₖ
Penyelesaian:
Hukum kekekalan momentum:
Kelentingan:
Eliminasi
4v'ₕ+5v'ₖ = -18 [×1]
-v'ₕ+v'ₖ = 18 [×4]
.
4v'ₕ+5v'ₖ = -18
-4v'ₕ+4v'ₖ = 72
________________ +
9v'ₖ = 54
v'ₖ = 6 m/s
[v'ₖ = (+) → arahnya ke kanan]
Subtitusi v'ₖ = 6 ke (2)
-v'ₕ+v'ₖ = 18
-v'ₕ+6 = 18
-v'ₕ = 12
v'ₕ = -12 m/s
[v'ₕ = (-) → arahnya ke kiri]
Jawaban: B