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## Homework Statement

On a straight road you start your car and increase the speed at a steady rate to 45 miles per hour during a 5 second interval. Calculate:

a)the average speed during the 5 seconds

b) the acceleration in miles per second at t = 3.2 sec. after you start your car

c) the speed of the car at t = 2.5 sec.

d) the time when the speedometer will read the average speed you calculated for part a) as the instantaneous speed.

## Homework Equations

Ave. speed = Vf + Vo/2 = (45 mi/hr + 0 mi/hr)/2 = (45mi/hr)/2 = 22.5 mi/hr

## The Attempt at a Solution

Ave. speed = Vf + Vo/2 = (45 mi/hr + 0 mi/hr)/2 = (45mi/hr)/2 = 22.5 mi/hr

The speed of the car at t = 2.5 seconds is: change in distance divided by change in time

I am not sure how to find the acceleration, or the time when the speedomoter will read the average speed in part a) as the instantaneous speed.