高中物理求解D选项,详解谢谢! 10
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初步计算,D选项不正确,请自己再计算一遍:
d+L=vot
H-L=1/2gt²
H-L=1/2g[(d+L)/vo]²
d=vot'
H-y=1/2gt'²
H-y=1/2g(d/vo)²
y=H-1/2g(d/vo)²=L+1/2g[(d+L)/vo]²-1/2g(d/vo)²
=L+1/2g[(2d+L)L]/(vo)²
=L+1/2g[(2d+L)L]t²/(d+L)²
=L+[(2d+L)L](H-L)/(d+L)²
=L+[(10L+L)L](3L-L)/(5L+L)²
=L+11/18L
=29/18L
d+L=vot
H-L=1/2gt²
H-L=1/2g[(d+L)/vo]²
d=vot'
H-y=1/2gt'²
H-y=1/2g(d/vo)²
y=H-1/2g(d/vo)²=L+1/2g[(d+L)/vo]²-1/2g(d/vo)²
=L+1/2g[(2d+L)L]/(vo)²
=L+1/2g[(2d+L)L]t²/(d+L)²
=L+[(2d+L)L](H-L)/(d+L)²
=L+[(10L+L)L](3L-L)/(5L+L)²
=L+11/18L
=29/18L
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