A block of mass m, attached to a spring of spring constant k, oscillates on a smooth horizontal table. The other end of the spring is fixed to a wall. If it has a speed v when the spring is at its natural length, how far will it move on the table before coming to an instantaneous rest

• A.  \[\sqrt{\frac{\upsilon m}{k}}\] 
• B.         \[\sqrt{\frac{\upsilon k}{m}}\]
• C.  \[u\sqrt{\frac{k}{m}}\]
• D.         \[u\sqrt{\frac{m}{k}}\]