Solution:
Given:Mass $$m = 5 \text{ kg}$$,Acceleration $$a = 3 \text{ m/s}^2$$.Force $$F$$ can be calculated using Newton's second law:$$F = m \cdot a$$.$$F = 5 \text{ kg} \cdot 3 \text{ m/s}^2$$,$$F = 15 \text{ N}$$.Thus, the force is $$15 \text{ N}$$.