To find the mass (M), we can first find the acceleration of the object using the formula:

F = M * a

Where F is the force and a is the acceleration. We are given that the force is 20 N.

a = F / M
=> 20 = M * a

Now, we can use the formula for centripetal acceleration to find the mass:

a = v^2 / r
=> a = (2^2) / 6

Now we substitute the value of acceleration in terms of M to solve for mass:

20 = M (2^2 / 6)
20 = M 4 / 6
20 = (4 / 6) * M
20 = 0.6667M
M = 30 kg

Therefore, the mass of the object is 30 kg.