A spring of constant k = 5 ×10^3 N/m is stretched initially by 5 cm from the unstretched position. Then, the work required to stretch it further by another 5 cm is

Q: A spring of constant k = 5 × 10³ N/m is stretched initially by 5 cm from the unstretched position. Then, the work required to stretch it further by another 5 cm is

(a) 12.50 N-m

(b) 18.75 N-m

(c) 25.00 N –m

(d) 6.25 N-m

Ans: (b)