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L = 1/2 (a+b) T
18 = 1/2 (4+8). ( t-2 )
18 = 1/2 12. ( t-2 )
18 = 6t - 12
30 = 6t
t = 5s
no.23
gerak vertikal ke atas
g = vt-vo/t
-10 = 0-30/t
-10 = -30/t
t = 3s
jadi pada t = 4, benda bergerak ke bawah.
Yang jelas soalnya no.22 dan no.23 doang.
Semoga membantu