A swimmer's speed changes from 3.8 m/s east to 2.4 m/s east in the final 8.2 s of the race. What was her acceleration?
-0.17m/s. see my comments on the other guys for clarification
They're both wrong .... It's (1.4m/sec) / (-8.2sec)=. -.170 m/sec^2. Note the units