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The vessel is filled with 1000 litres of...

The vessel is filled with 1000 litres of water at 8 a.m. The volume of water in this vessel at t hours after it is filled is observed to be `v(t=1000-200t+5t^(2)`. What is the rate of change of volume (i) at 8:a .m. (ii) at noon (12:00 p.m.)?

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(i) -200L/hrs
(ii) -160 L/hrs
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