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Sagot :
If you consider that the power is the same before and after, you have Pplayer1=81*6,5=Pplayer2=140*SpeedAfter
=> SpeedAfter = 81 * 6,5 / 140 = 3,76 m/s
=> SpeedAfter = 81 * 6,5 / 140 = 3,76 m/s
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