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2014-05-09T00:43:42-03:00
Fr=M.A___ 28=7a___ a=4m/s^2

a=Δv/Δt____a=V-V0/Δt____a=V/Δt___4=V/2___V=8m/s

Ec=1/2MV^2___ Ec=7.(8)^2/2____Ec=7.64/2___Ec=448/2__Ec=224J
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