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Vo= 10m/s
g=10 m/s²
vt=vo+gt
0= 10+ 10 t
t=1
ht= vo.t + 1/2 gt²
ht= 10.1 + 1/2. 10. 1
ht= 10+ 5= 15
w= Δep
w= mg(h2-h1)
w= 0,5 • 10 (15-0)
w= 75 joule