physics
posted by ted on .
A man is driving his car ata velocity of 100km/h on a straight road. H e sees a traffic jam at a distance and slows down to 12.5m/s in 3.0s. What is the average acceleration of the car? pls help.
I know that the formula for average acceleration is V2V1 divided by T2T1 but the question only gives one time. so am confused.
pls help.

The time is takes to slow down is T2  T1. That is given as 3.0s.