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b)jarak 2 sekon/St2s=1/2.g.t²=1/2.10.2.2=20 meter
maka jarak dari tanah= 30-20=10 meter
kedudukan = 30-4,8
= 25,2
= 9,8
b.
kedudukan = 30 - 19,6
= 10,4
= 19,6