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F1 = 10 N
F2 = 5N
F3 = -10N
m = 2kg
a = ?
∑F = m a
(10+5-10) = 2a
5 = 2a
a = 2,5 m/s²
6.
Ek 1 = 1
Ek 2 = 4
v1 : v2 = ?
(v1/v2)² = Ek1/Ek2
v1/v2 = √1/4
v1/v2 = 1/2
sehingga v1 : v2 adalah 1 : 2
7.
KM benda 1 = s/h = 3/1,2 = 2,5
KM benda 2 = s/h = 5/2 = 2,5
KM benda 3 = s/h = 4/1,5 = 2,667
KM benda 4 = s/h = 3,6/1,2 = 3
jadi yang memiliki KM sama adalah benda 1 dan 2 (A)