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Vson²=Vo²+2a.2X⇒ 20²=10²+4aX⇒400-100=4aX⇒ 300=4ax⇒ ax=75
AB arası Vb²=10²+2.a.x⇒ Vb²=100+150⇒ Vb=√250=5√10 m/s