What is the question? Do you want to know the initial velocity? The deceleration rate?
Since the average velocity is 40/7 = 5.714 m/s, the initial velocity Vo is given by
(Vo + 2.45)/2 = 5.714
Vo = 8.98 m/s
The deceleration rate, a, can be calculated using
a = (Vo - 2.45)/7.00 = ___
A truck covers 40.0 m in 7.00 s while smoothly slowing down to a final velocity of 2.45 m/s.
3 answers
original speed and acceleration
That is what I have derived for you