Answer:
0.64 s
Step-by-step explanation:
It's period of oscillation (T) can be determined by,
T = 2


Where l is the length (extension on the spring), and g the acceleration due to gravity.
But,
l = 10 cm = 0.1 m
g = 9.8 m/

Thus,
T = 2 x

= 0.6350
T = 0.64 s
The period of oscillation would be 0.64 s.