A block of mass .m. moving with a speed .upsilon. compresses a spring through a distance .x. before its speed reduces by 25%. The spring constant of the spring is

A block of mass .m. moving with a speed .upsilon. compresses a spring

1.	A block of mass .m. moving with a speed .upsilon. compresses a spring through a distance .x. before its speed reduces by 25%. The spring constant of the spring is
Answer» `(m upsilon^(2))/(4 x^(2))` `(3m upsilon^(2))/(4x^(2))` `(7M upsilon^(2))/(16 x^(2))` `(9M upsilon^(2))/(16 x^(2))` Answer :C