Answer
First find the resultant force of the perpendicular forces.
$$(3 N)^{2}+(4 N)^{2}=F^{2}$$
$$F=5 N$$
Use Newton's second law. $a = \frac{F}{m} = \frac{5 N}{2.0 kg} = 2.5 \frac{m}{s^{2}}$.
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