Question

Calculate the spring constant, spring changes it length by 10 cm if 20 N force is applied to the spring.

• A. 150$\frac{N}{m}$
• B. 400$\frac{N}{m}$
• C. 600$\frac{N}{m}$
• D. 200$\frac{N}{m}$
• E. 100 $\frac{N}{m}$

Answer 1

The correct option is D 200$\frac{N}{m}$

Given : $F_s=20$ N $x=10$ cm $=0.1$ m

$\therefore$ $F_s=kx$

OR $20=k\times 0.1$ $⟹k=200$ $N/m$