A bullet moving with an initial speed of vo strikes and embeds itself in a block of wood which is suspended by a string, causing the bullet and block to rise to a maximum height h. Which of the following statements is true of the collision? o The initial momentum of the bullet before the collision is equal to the momentum of the bullet and block at the instant they reach the maximum height h. the bullet immediately after the collision the potential energy of the bullet and block at the instant they reach the maximum O The initial momentum of the bullet before the collision is equal to the momentum of o The kinetic energy of the bullet and block immediately after the collision is equal to height h. energy of the bullet and block when they reach the maximum heighth energy of the bullet and block immediately after the colision O The initial kinetic energy of the bullet before the collision is equal to the potential o The initial kinetic energy of the bullet before the collision is equal to the kinetic

Conservation of linear momentum applies when no external force acts . In case bullet hits the block , the only external force is gravitational force which applies on them . But when we consider a very small fraction of time , the effect of external force will be minimum . So we can apply conservation law. So conservation law is followed for momentum of the system just before and after the collision.

The initial momentum of the bullet before the collision is equal to the momentum of the bullet and block immediately after the collision.

The initial kinetic energy of the bullet before the collision is equal to the potential energy of the bullet and block when they reach the maximum height .