Read the following write up and answer the questions based on that. The graph below gives the co....

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Read the following write up and answer the questions based on that.
\( \mathrm{P} \)
The graph below gives the coordinate of a particle travelling along the \( \mathrm{X} \)-axis as a function of time. \( \mathrm{AM} \) is the tangent to the curve at the starting moment and \( \mathrm{BN} \) is tangent at the end moment \( \left(\theta_{1}=\theta_{2}=120^{\circ}\right) \).

The average acceleration during the first 20 seconds is
(A) \( -1 \mathrm{~m} / \mathrm{s}^{2} \)
(B) \( 1 \mathrm{~m} / \mathrm{s}^{2} \)
(C) zero
(D) \( 2 \mathrm{~m} / \mathrm{s}^{2} \)


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