1. A football player, starting from rest at the line ofscrimmage, accelerates a

Question

1. A football player, starting from rest at the line ofscrimmage, accelerates a straight line for a time of 1.5 s. Then,during a negligible amount of time, he changes the magnitude of hisacceleration to a value of 1,1 m/s^2. With this acceleration, hecontinues in the same direction for another 1.2 s, until he reachesa speed of 3.4 m/s. Wha is the value of his acceleration (assumedto be constant) during the inital 1.5-s period? Show me step by step how the problem above works.Thanks. 1. A football player, starting from rest at the line ofscrimmage, accelerates a straight line for a time of 1.5 s. Then,during a negligible amount of time, he changes the magnitude of hisacceleration to a value of 1,1 m/s^2. With this acceleration, hecontinues in the same direction for another 1.2 s, until he reachesa speed of 3.4 m/s. Wha is the value of his acceleration (assumedto be constant) during the inital 1.5-s period? Show me step by step how the problem above works.Thanks.

Explanation / Answer

the final speed of the football player at the end of 1.5 sinterval
v = u + at u = 0 or v = at the speed of the football player after 1.2 s interval is v1 = u1 + a1 * t1 v1 = 3.4 m/s u1 = v = at,t = 1.5 s a1 = 1.1 m/s^2 t1 = 1.2 s or a = (v1 - a1 * t1/t)

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