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g = 10 m/s²
h = 25 m
Vt² = V0² + 2gh
Vt² = 20² + 2 . 10 . 25
Vt² = 400 + 500
Vt² = 900
Vt = √900
Vt = 30 m/s
Kecepatan kelereng setelah di tanah = 30 m/s
Vt = V0 + gt
30 = 20 + 10.t
30 - 20 = 10t
10 = 10t
t = 10/10
t = 1 s
waktunya 1 s