Step-by-step explanation:
It is given that,
Mass of the object, m = 350 g = 0.35 kg
Spring constant of the spring, k = 5.2 N/m
Amplitude of the oscillation, A = 10 cm = 0.1 m
Frequency of a spring mass system is given by :

Time period:

Maximum velocity in the spring is given by :


The maximum force acting in the spring is :

Hence, this is the required solution.