How should we write Newton’s second law for a body on which several forces act?

If several forces are applied to the body, the acceleration of the body is directly proportional to the resultant of all forces and inversely proportional to the mass of the body:
d = F / m

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.