Jawaban:
56. (C)
57. (A)
Penjelasan:
56.
V = Vo -a.t
(100% - 40%). 20 = 20 - a. 2
12 - 20 = - 2. a
a = 8/2 = 4 m/s²
fk = μ.N = μ. m. g
fk = m.a
μ. m. g = m.a
μ = a/g = 4/10 = 0,4
57.
e= -( Va' - Vb' )/(Va - Vb )
0,4 = - (Va' - 15)/(20- 0)
8 = -Va' +15
Va' = 15 - 8 = 7 m/s searah dengan kecepatan sebelum tumbukan
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Jawaban:
56. (C)
57. (A)
Penjelasan:
56.
V = Vo -a.t
(100% - 40%). 20 = 20 - a. 2
12 - 20 = - 2. a
a = 8/2 = 4 m/s²
fk = μ.N = μ. m. g
fk = m.a
μ. m. g = m.a
μ = a/g = 4/10 = 0,4
57.
e= -( Va' - Vb' )/(Va - Vb )
0,4 = - (Va' - 15)/(20- 0)
8 = -Va' +15
Va' = 15 - 8 = 7 m/s searah dengan kecepatan sebelum tumbukan