40. The value of \( c \) guaranteed to exist by the Mean Value Theorem for \( V(x) = x^2 \) in the interval \([0, 3]\) is






Answer is: option3

\(\frac{3}{2}\)

Solution:

Verify the conditions for MVT:

  1. \( V(x) = x^2 \) is continuous on \([0, 3]\).
  2. \( V(x) = x^2 \) is differentiable on \((0, 3)\).

Compute the average rate of change (slope of the secant line):

\[ \frac{V(3) - V(0)}{3 - 0} = \frac{9 - 0}{3} = 3 \]

Find the derivative of \( V(x) \):

\[ V'(x) = 2x \]

Set the derivative equal to the average rate of change and solve for \( c \):

\[ V'(c) = 2c = 3 \quad \Rightarrow \quad c = \frac{3}{2} \]

Check if \( c \) lies within the interval \( (0, 3) \):

\[ c = \frac{3}{2} \text{ is in } (0, 3) \]

Final Answer: \( \boxed{C} \)

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