You have a light spring which obeys Hooke's law. This spring stretches 2.22 cm vertically when a 2.60 kg object is suspended from it. Determine the following.

(a)the force constant of the spring (in N/m)

N/m

(b)the distance (in cm) the spring stretches if you replace the 2.60 kg object with a 1.30 kg object

cm

(c)the amount of work (in J) an external agent must do to stretch the spring 8.20 cm from its unstretched position

J