Question

there are required 124 ft-lb of work to compress a spring from its free length y1 to that of y2= 2.5 in; the constant scale is K=100 lbf/in. Find the free lenght

Answer 1

free length $x$ ,

Hooke’s Law, $F = kx$

$x = \frac{F}{k} = \frac{124}{100} =$ 1.24 in