Answer:
The total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.
The answer is C..........
(Mass does not affect the pendulum's swing. The longer the length of string, the farther the pendulum falls; and therefore, the longer the period, or back and forth swing of the pendulum. The greater the amplitude, or angle, the farther the pendulum falls; and therefore, the longer the period.)
