A block of mass `0.18 kg ` is attached to a spring of force constant `2 N//m` The coefficient of friction between the block and the force is `0.1` insitially its block is at rest and the block as spring is an streched , As impalse is given to the block as shown in the figure . The block sides a distance of ` 0.06` in and comes to the first time . The initial velocity of the for blocks is mis `V = N 10` then `N` is .