Which one below has an initial momentum and fired into a ballistic pendulum? a. Pendulum b. Meter stick c. Projectile d. Meter ball

The correct answer is c. Projectile.<br /><br />In the context of a ballistic pendulum experiment, the projectile is the object that is fired into the pendulum. The projectile is typically a small object, such as a ball, that is launched or projected. The initial momentum of the projectile is transferred to the pendulum when it collides with the pendulum's target, causing the pendulum to swing and rise to a certain height. The height to which the pendulum rises can then be used to calculate various properties, such as the velocity of the projectile at the moment of impact.