Question

If work done in compressing a spring by a distance x is W, work done in compressing it by distance 2x from beginning will be?
(a)W
(b)2W
(c)3W
(d)4W​

Answer 1

Answer:3W

Explanation: W=1/2kx^2

In the second case

1/2k{(2x)^2-x^2}

=1/2k(4x^2-x^2)

=1/2k(3x^2)

=3(1/2kx^2)

=3W