Jawaban:
Newton's Law of Energy Conservation
KE1 + PE1 = KE2 + PE2
1/2 x m x v² + m x g x h = 1/2 x m x v² + m x g x h
1/2 x 800 x 40² + 800 x 9.81 x 0 = KE2 + 800 x 10 x 10
KE2 = 1.280.000 - 80.000
= 1.200.000 gram m²/s² (milijoule)
= 1.200 joule
m = massa (berat)
v = kecepatan
g = gravitational force
h = tinggi
asumsi:
g = 10 m/s²
semoga dapat dimengerti