Answer:
4.3 N/m
Explanation:
m = 230 g = 0.230 kg, x = 8.2 cm
in 13 oscillations, time taken = 19 s
In 1 oscillation, time taken = 19 / 13 = 1.46 s
By the use of formula of time period , Let k be the spring constant.
[tex]T = 2\pi \sqrt{\frac{m}{k}}[/tex]
[tex]1.46 = 2\pi \sqrt{\frac{0.230}{k}}[/tex]
0.054 = 0.230 / k
k = 4.26 N/m
k = 4.3 N/m