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v0 = 30m
v1 = 15
v2 = 0
a2 = 75
dit : s2 ?
jwb :
a1 = v1² - v0² / 2s0
= 15²-30² / 2.75
= 225-900 / 150
= 4,5m/s²
a2 = v1² - v0² / 2a1
= 15²-30² / 2.4,5
= 225-900 / 9
= 25 m