解:dr/dt=5
s=4πr^2,ds/dt=8πrdr/dt=8x3.14x50x5=6280
v=4π/3r^3,dv/dt=4πr^2dr/dt=4x3.14x50x50x5=157000
设深为h时,对应的半径为r=0.5h
v=1/3hπr^2=1/12πh^3
所以dv/dt=1/4πh^2dh/dt
所以16×0.001=1/4×3.14×0.16dh/dt
dh/dt=0.127m/s
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