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h = 30 m
g = 10 m/s²
Ek = 900 J
dit : m = ...
Vt² = Vo² + 2gh
Vt² = 0 + 2(10)(24)
Vt² = 480
Vt = 4√30 m/s
Ek = 1/2 mv²
900 = 1/2 m (4√30)²
900 = 1/2 (480) m
900 = 240 m
m = 3,75
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