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= 6×10×20
= 1200
Ep = m × g × h
= 6 × 10 × 20
= 1200 J
EM = EP + EK
EM = 1200+ 0
EM = 1200
pada saat diatas tanah EKnya total
EK = 1/2 × m × v²
1200 = 1/2 × 6 ×v²
1200 = 3 × v²
1200/3 = v²
400 = v²
√400 = v
20 m/s = v
jadi kecepatan buah saat diatas tanah adalah 20 m/s