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misal g = 10 m/s
250 = 1/2 mv² + mgh
250 = 1/2x1x v² + 1x10x20
250 = 1/2 v² + 200
250-200 = 1/2 v²
50 = 1/2 v² ----> kali 2 kedua ruas
100 = v² ----> akar dari 100
v = 10 m/s
Em = m x g x h + 0,5 x m x v^2
250 = 1 x 10 x 20 + 0,5 x 1 x v^2
250 = 200 + 0,5 x v^2
0,5 x v^2 = 250 - 200
0,5 x v^2 = 50
v^2 = 2 x 50
v = √100
v = 10 m/s
^ = pangkat