A football player, starting from rest at the line of scrimmage, accelerates along a straight line for a time of \( 1.5 \mathrm{~s} \). Then, during a negligible amount of time, he changes the magnitude of his acceleration to a value of \( 1.1 \mathrm{~m} / \mathrm{s}^{2} \). With this acceleration, he continues in the same direction for another \( 1.2 \mathrm{~s} \), until he reaches a speed of \( 3.4 \mathrm{~m} / \mathrm{s} \). What is the value of his acceleration (assumed to be constant) during the initial \( 1.5 \mathrm{~s} \) period?
(A) \( 0.91 \mathrm{~m} / \mathrm{s}^{2} \)
(B) \( 1.1 \mathrm{~m} / \mathrm{s}^{2} \)
(C) \( 1.4 \mathrm{~m} / \mathrm{s}^{2} \)
(D) \( 2.2 \mathrm{~m} / \mathrm{s}^{2} \)
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