maxiJ
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Homework Statement
A rock is rolled in the sand. It starts at 5.0 m/s, moves in a straight line for a distance of 3.0m and then stops. What is the magnitude of the average acceleration?
Homework Equations
aavg = change in V/ change in time
magnitude of acceleration = change of speed/time interval.
The Attempt at a Solution
i think i am thinking too hard about this problem. seems simple but cannot get the right answer
found time = 1.67 s and tried to plug in for average acceleration. 5.0/1.67 = 2.99 m/s^2
the correct answer is 4.2 m/s^2.
?? can't figure out what i am doing wrong.