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Verified answer
ma = mb = m
ha = h. va = v
hb = 2h. Ekb = __?
v = √(2 g h)
vb / va = √(2 g hb) / √(2 g ha)
vb = va • √(hb / ha)
vb = v √(2h / h)
vb = v√2
Ekb = ½ m vb²
Ekb = ½ m (v√2)²
Ekb = m v² ← jwb