The work done in extending a spring by `x_0` is `W_0`. Find the work done in further extension `x_0`.

Work done by a spring force is

On which the work done by a spring depends ?

When a spring is stretched by a distance x, it exerts a force given by F=( -5x-6x^3 ) N. Find the work done when the spring is stretched from 0.1 m to 0.2 m.

A magnet of moment M is lying in a magnetic field of induction B. W1 is the work done in turning it from 0^(@) to 60^(@) and W_(2) is the work done in turning it from 30^(@) to 90^(@) . Then

STATEMENT-1: An elastic spring of force constant k is stretched by a small length x. The work done in extending the spring by a further length x is 2kx^(2) . because STATEMENT-2: The work done in extending an elastic spring by a length x is proportional to x^(2) .

A spring which is initially in un-streatched condition, is first stretched by a length x and again by a further length x. The work done in the first case W_(1) is one third of the work done in second case W_(2) . True of false ?