The resultant force on the object is
∑ F = 〈0, 8〉 N + 〈6, 0〉 N = 〈6, 8〉 N
which has a magnitude of
F = √((6 N)² + (8 N)²) = √(100 N²) = 10 N
By Newton's second law, the acceleration has magnitude a such that
F = m a
10 N = (2 kg) a
a = (10 N) / (2 kg)
a = 5 m/s²
so the answer is B.
