A block of mass 2kg is attached with a spring of spring constant 4000Nm^-1 and the system is kept on smooth horizontal table. The other end of the spring is attached with a wall. Initially spring is stretched by 5cm from its natural position and the block is at rest. Now suddenly an impulse of 4kg-ms^-1 is given to the block towards the wall. Approximate distance travelled by the block when it comes to rest for a second time (not including the initial one) will be (Take sqrt(45)=6.70) Displacement of the rod by the time the insect meet the moth is

A block of mass 2kg is attached with a spring of spring constant 4000N

1.	A block of mass 2kg is attached with a spring of spring constant 4000Nm^-1 and the system is kept on smooth horizontal table. The other end of the spring is attached with a wall. Initially spring is stretched by 5cm from its natural position and the block is at rest. Now suddenly an impulse of 4kg-ms^-1 is given to the block towards the wall. Approximate distance travelled by the block when it comes to rest for a second time (not including the initial one) will be (Take sqrt(45)=6.70) Displacement of the rod by the time the insect meet the moth is
Answer» (a) `L/2` (B) `L` (c) `(3L)/(4)` (d) zero Solution :`p_i=p_f` `:. 0=(8m)(2v)-(16m)(v)+(48m)v^'` Here `v^'=` ABSOLUTE speed of rod `=0` `:.` Displacement of rod=0`