60 ms-1
72 ms-1
84 ms-1
108 ms-1
Correct answer is B
speed = \(\frac{dx}{dt}\)
\(\frac{dx}{dt}\) = 10 + 12t2
\(\frac{dx}{dt}\) = 24t
\(\frac{dx}{dt}\) =24 x 3
\(\frac{dx}{dt}\) = 72 ms-1
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