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## Homework Statement

The vector position of a 4.00 g particle moving in the

*xy*plane varies in time according to

where

*t*is in seconds and

Determine the acceleration of the center of mass at

*t*= 2.40.

## Homework Equations

## The Attempt at a Solution

A=-4i+4j

i took the second derivative of position to give me acceleration. This resulted in -4i+4j which is wrong[/B]

#### Attachments

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