Helppppppo

Two carts of equal mass collide. If neither is moving after the collision, what can you conclude about their velocities before the collision. O a. The velocities were in the opposite directions and the velocity of one was twice the velocity of the other. O b. The velocities were in the same direction, and the magnitudes were the same. O c. The velocities were equal magnitude and opposite directions. O d. The velocities were in the same direction, but the velocity of one was twice the velocity of the other