Physics
posted by Emily .
A driver entering the outskirts of a city takes her foot off the accelerator so that her car slows down from 90 km/h to 50 km/h in 10 s. Find the car's average acceleration.

Physics 
drwls
Change the speeds to m/s, then divide the difference by 10 s.
The change in speed is 40 km/h, which is 11.11 m/s
The acceleration rate will be negative
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