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まずm消去↓
9.8×40＝1/2×Vc*(二乗)+9.8×30
ノーマルにやっていくと、
392＝1/2×Vc*+294
−1/2×Vc*＝294−392
−1/2×Vc*＝−98 ←〈別解〉でもう少し楽に♪
Vc*＝196＝2×2×7×7
Vc＝14
〈別解〉
−1/2×Vc*＝9.8(30−40)
−1/2×Vc*＝−98
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