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What is the magnitude of the average acceleration?

a rock is rolled in the sand and it starts at 5 meters/second, it moves in a straight line for a distance of 3 meters and then stops....what is the magnitude of the average acceleration.??

my attempt at this was to simply divide 5 by 3 giving me 1.6 m/s

is this correct ?
 

ideasrule

Homework Helper
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Re: acceleration

What are the units if you divide 5 m/s by 3 m?

To get you started, search your kinematics equations. Do you see one relating distance travelled, acceleration, and speed?
 

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