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pakai rumus benda jatuh bebas
v = √(2gh)
= √(2 x 10 x 5)
= √(100)
= 10
dan pakai yg kekekalan
1/2 mv² + mgh = 1/2 mv² + mgh
(m nya doret,)
0+ 10 x 10 = 1/2 v² + 10 x 5
100-50 = 1/2 v²
100 = v²
10 = v