Q.
When a body of mass M is hung from a spring, the spring extends by 1 cm. If the body of mass 2 M be hung from the same spring, the extension of spring will be
Key Idea: Restoring force is proportional to displacement. When body is hung from a spring and left, it executes SHM, hence F=kx=Mg where k is spring constant and x the extension produced. Given, M1=M,M2=2M,x1=1cm∴x2=M1M2x1=12×1=2cm