" A spring of natural length L compressed to length "7L/8" exerts a force "F_(0)" .The work done by the spring in restoring itself to natural length is "

Mass m is connected with an ideal spring of natural length l whose other end is fixed on a smooth horizontal table. Initially spring is in its natural length l . Mass m is given a velocity 'v' perpendicular to the spring and released . The velocity perpendicular to the spring when its length l+x , will be

A spring is stretched by distance x and then compressed to same distance from its original length. The work done by the spring force is (k=spring constant)

Two blocks A and B of masses m and 2m are connected by a massless spring of natural length L and spring constant k . The blocks are intially resting on a smooth horizontal floor with the spring at its natural length , as shown . A third identical block C of mass m moves on the floor with a speed v_(0) along the line joining A and B and collides elastically with A . FInd (a) the velocity of c.m. of system (block A + B + spri ng) and (b) the minimum compression of spring.

A wire fixed at the upper end stretches by length l by applying a force F. The work done in stretching is

Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant k. The blocks are initially resting on a smooth horizontal floor with the spring at its natural length. A third identical block C also of mass m moves on the floor with a speed v along the line joining A and B and collides with A. Then The kinetic energy of the A-B system at maximum compression of the spring is mv^(2)//4 The maximum compression of the spring vsqrt(m//3k) The kinetic energy of the A-B system at maximum compression The maximum coppression of the spring is vsqrt(m//k)

A spring with natural length l_0 has a tension T_1 when its length is l_1 and the tension is T_2 when its length is l_2 .The natural length of spring will be:

A spring of spring constasnt 50 N/m is compressed from its natural position through 1 cm. Find the work done by the work done by the spring force on the agency compressing the spring.

Two masses m and 2m are attached to two ends of an ideal spring as shown in figure. When thye spring is in the compressed state, the energy of the spring is 60 J, if the spring is released, then at its natural length

If a wire is extended to a new length , the L, the work done is