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If an airplane is moving at velocity v , the drag D (in N ) on the plane isD=av2+bv2 , where a=5.[a]0103 and b=3.0[e]108 .

If an airplane is moving at velocityv

, the dragD

(inN) on the plane isD=av2+bv2

, wherea=5.[a]0103

andb=3.0[e]108

. Find the value(s) ofv

(in km/h), for which the drag is the least. Round the answer to one decimal place. Both coefficients,aandb, already account for the unit converstion (from m/s to km/h).

CIN 32695

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