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v=v0+at から
6.0=8.0+a×

v²-v₀²=2ax から
6.0²-8.0²=2×a×28
→ 36-64=56a
→ 56a=-28
→ a=-0.5m/s²
加速度がマイナスなので、方向は西向き

ののの

ありがとうございます

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