Answer:
B. 3J
Explanation:
Work done to stress a spring = 1/2Fe ............. equation 1
Where F = force required to stretch the spring, e = extension.
Where
F =bx²............................. Equation 2
Given: x = 1 m, b = 6 N/m²
Substitute into equation 2
F = 6(1)²
F = 6 N.
Also substitute the value of F into equation 1
Work done to stress a spring = 1/2(6)(1)
Work done to stress a spring = 6/2
Work done to stress a spring = 3 J
Hence the right option is B. 3J
