应该用能量守恒来确定v和alpha的关系
1/2mv^2=mgr(CosA-Cos45)
v^2=2gr(CosA-Cos45)
应该用能量守恒来确定v和alpha的关系
1/2mv^2=mgr(CosA-Cos45)
v^2=2gr(CosA-Cos45)
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