Answer
first derivative $=-6.3u^2+7u$
second derivative =$ -12.6u+7$
Work Step by Step
first derivative $= (-2.1u^3+3.5u^2+16)' =-6.3u^2+7u$
second derivative = derivative of the first derivative $ = (-6.3u^2+7u)' = -12.6u+7$
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