The spring force = kx = mg. k is spring constant = 200 N/m x is the spring elongation = 0.2 m F = 200×0.2= 40 N Now, F = mg wil be the weight of the object Thus, weight is 40 N. Thus, now we can also find the mass of object, m = F/g = 40 N/9.8 Because g is acceleration due to gravity = 9.8 m/sec ^2 m = 4.08 kg
