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= 1/2.9.8.043
= 1/2.9.8.924.5
= 924.5 : 2 . 9.8
= 90.601
s = 3-0.5 = 2.5m
s = vo.t + 1/2at^2
s = 0.t +1/2.9,8t^2
2,5 = 4,9t^2
t^2 = 2,5/4,9
t = 5/7
vt = vo + at
vt = 0 + 9,8.5/7
vt = 7
Ek = 1/2mv^2
Ek = 1/2.0,07.7^2
Ek = 1,715J