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A proton initially has a velocity vo = 4.0i - 2.0j + 3.0k and 4.0 seconds...

A proton initially has a velocity vo = 4.0i - 2.0j + 3.0k and 4.0 seconds later its velocity is v = -2.0i - 2.0j + 5.0k (both in m / s). Find the average acceleration of the proton in vector form.
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