Question

A force of 64 N is applied to an 8kg mass. what is the acceleration of the mass

Answer 1

If this is the only force applied, you could use the Newton's second law.

$\sum F = ma \rightarrow 64N = 8kg \cdot a \rightarrow a = \dfrac{64}{8} \dfrac{m}{s^2} = 8 \dfrac{m}{s^2}$ (this value corresponds to the modulo of the acceleration)