A football player, starting from rest at the line of scrimmage, accelerates along a straight line for a time of 4.19 s. Then, during a negligible amount of time, he changes the magnitude of his acceleration to a value of 1.45 m/s2. With this acceleration, he continues in the same direction for another 2.63 s, until he reaches a speed of 7.33 m/s. What is the value of his acceleration (assumed to be constant) during the initial 4.19 -s period?

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