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The position of a moving car at time t i...

The position of a moving car at time t is given by `f(t)=at^(2) + bt+c, t gt 0` , where a ,b and c are real numbers greater than 1. Then the average speed of the car over the time interval `[t_1,t_2]` is attained at the point :

A

`(t_2-t_1)//2`

B

`a(t_2-t_1)+b`

C

`(t_1+t_2)//2`

D

`2a(t_1+t_2)+b`

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