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Assuming that petrol burnt per hour in driving a motor boat varies as the cube of its velocity. Show that the most economical speed when going against a current of k km/hour is \( \large\frac{3k}{2} \) km/hour.
cbse
class12
modelpaper
2012
sec-b
q13
math
Share
asked
Jan 31, 2013
by
thanvigandhi_1
edited
Jul 25, 2013
by
sreemathi.v
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Assuming that petrol burnt per hour in driving a motorboat varies as the cube of its velocity. Show that the most economical speed when going against a current of p km/hour is \( \large\frac{3p}{2}\) km/hour.
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