27.Spring of unstretched length L has a mass M with one end fixed to a rigid support.Assuming spring to be made of a uniform wire ,the kinetic energy possessed by it if its free end is pulled with uniform velocity V is .

Q. A spring of unstretched length $l$ has a mass $m$ with one end fixed to a rigid support. Assuming spring to be made of a uniform wire, the kinetic energy possessed by it if its free end is pulled with uniform velocity $v$ is

Q. A massless spring of natural length of $0.5m$ and spring constant $50N/m$ has one end fixed and the other end attached to a mass of $250g$. The spring mass system is on a smooth floor. The mass is pulled until the length of the spring is $0.6$ and then released from rest. The kinetic energy of the mass when the length of the spring is $0.5m$ is

Q. A body moving with a kinetic energy of $20$ J on a horizontal frictionless surface hits spring whose one end is fixed to a rigid wall and it compresses the spring and it comes to rest. What is the potential energy of spring when it is compressed to the maximum?

Q. A spring store $5J$ of energy when stretched by $25cm$. It is kept vertical with the lower end fixed. A block fastened to its other end is made to undergo small oscillation. If the block makes $5$ oscillation each second, what is the mass of the block?