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Chain Rule, Log Differentiation & Rate of Change · Question 110 of 130

What is the radius of the slick 10 seconds after it starts?

Question 110

EasyOriginal question

An oil slick spreads as a circle whose radius grows at a steady 2 m/s, starting from a point.

What is the radius of the slick 10 seconds after it starts?

5 mCorrect answerYour answer10 mCorrect answerYour answer20 mCorrect answerYour answer200 mCorrect answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

It grows at a steady 2 m/s from 0.
$2 \times 10 = 20$ m.

Worth noting

5 m divides instead of multiplying.

Concept: A quantity from a steady rate
Typical timeTypical: 90 s
Your timeYours: —

The rule this testsRate of change of quantities

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