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(40)² = 2 . 10 h
1600 = 20 h
h = 1600 / 20
h = 80 m
+++++++++++++++++++++++++++
B)
cari kecepatan benda saat sampai pada 5 meter di atas tanah dihitung dari puncak h artinya sebesar hmaks - h(t) = 80-5 = 75 m
V² = 2gh
V = √2(10)(75)
V = √1500
V = √100 . 15
V = 10√15 m/s