A 1/2kg book is shoved across the table with an initial velocity of 2m/s. If it slides for a meter before coming to rest. a) what was its acceleration? Technically, this acceleration is negative, since the book is slowing downing.
b) What was the frictional force?

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if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

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