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W = F.s
W = mg . s
W = 750 . 10 . 10
W = 75000 Jolue
2)
Ek = 1/2 . m . v²
750 = 1/2 . 40 . v²
750 = 20 . v²
v² = 750/20
v² = 37,5
v = √37,5m/s
3)
Ep = m . g . h
6000 = m . 10 . 15
6000 = 150 m
m = 6000 / 150
m = 40 kg