What was the car's velocity at t=0?

[indietro]

Homework Statement

A car accelerates at 1.75 m/s2 along a straight road. It passes two marks that are 30.3 m apart at times t=3.80 s and t=5.15 s. What was the car's velocity at t=0?

Homework Equations

The Attempt at a Solution

Im actually not quite sure how to approach this question. Is there some way that i can find the velocity at the beginning of the time interval that is given?

 

[willem2]

What is the average speed over the interval from 3.8s to 5.15 s?

exactly when does the car have this average speed?

 

[indietro]

the average velocity over that time interval is 22.4 m/s. but I am not sure what you mean by:

exactly when does the car have this average speed?

 

[willem2]

the average velocity over that time interval is 22.4 m/s. but I am not sure what you mean by:

if the car goes has speed $v_i$ at the start of the interval and $v_f$ at
the end of the interval, its average speed is $(v_i + v_f)/2$. The speed at _______
is also $(v_i + v_f)/2$. (with constant acceleration)

 

[indietro]

so the middle of the interval (4.48s) would also have the velocity of 22.4 m/s ??