Acar traveling west in a straight line on a highway decreases its speed from 30.0 meters per second to 23.0 meters per second in 2.00 seconds. the car's average acceleration during this time interval is
a) 3.5 m/s2 east.
b) 3.5 m/s2 west.
c) 13 m/s2 east.
d) 13 m/s2 west

So option (a) is correct option

Explanation:

We have given final speed of the car = 23 m/sec

And initial speed of the car = 30 m/sec

Time in which speed is decreases t = 2 sec

From first equation of motion we know that v = u+at

So acceleration

Negative sign indicate that acceleration will be in opposite direction

So

So option (a) is correct option

answer( sicar );