怎么快点算出来v2,vo^2-v1^2=2a1L,vo^2-v2^2=2a2L,a1/a2=d1^2/d2^2
问题描述:
怎么快点算出来v2,vo^2-v1^2=2a1L,vo^2-v2^2=2a2L,a1/a2=d1^2/d2^2
vo^2-v1^2=2a1L,vo^2-v2^2=2a2L,a1/a2=d1^2/d2^2
L未知,d1=38,d2=40,vo=26,v1=10,快速求V2
答
vo^2-v1^2=2a1L.(1),vo^2-v2^2=2a2L.(2),a1/a2=d1^2/d2^2.(3),(1)÷(2),得:(vo^2-v1^2)/(vo^2-v2^2)=a1/a2=d1^2/d2^2,——》v2^2=[vo^2(d1^2-d2^2)+v1^2d2^2]/d1^2=[26^2(38^2-40^2)+10^2*40^2]/38^2=545...