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Newton's second law is expressed as Resultant force = mass x acceleration (F=ma) So a simple change of subject; acceleration = resultant force/mass (a = F/m) = (-i + 3j)/ 4 Final answer is (-i/4 + 3j/4) m/s^2 Note this Force is measured in Newtons(N) Mass is measured in Kg Acceleration is measured in metres per second squared
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