To find the tension T in the string, we can use the formula for tension in a string:

T = k m g

where:
T = tension in the string (in Newtons)
k = spring constant (in Newtons per meter) = 20 N/m
m = mass hanging on the string (in kilograms) = 0.2 kg
g = acceleration due to gravity (approx. 9.81 m/s^2)

Plugging in the values:

T = 20 N/m 0.2 kg 9.81 m/s^2
T = 39.24 N

Therefore, the tension in the string is 39.24 Newtons.