Question

A steel spring has a spring constant of 2 × 102 Nm-1. Calculate the weight of an object which when attached to the unloaded spring produces an extension of 50 mm. The elastic limit is NOT exceeded

Answer 1

$F=kx=200\cdot0.05=10\ (N)$

or

$m=F/g=10/9.81=1.02\ (kg)$