Sphere X, of Mass 2 Kg, Is Moving to the Right

Multiple Choice

Sphere X, of mass 2 kg, is moving to the right at 10 m/s.Sphere Y, of mass 4 kg, is moving to the left at 10 m/s.The two spheres collide head-on.The magnitude of the impulse of X on Y is:

A) twice the magnitude of the impulse of Y on X
B) half the magnitude of the impulse of Y on X
C) one-fourth the magnitude of the impulse of Y on X
D) four times the magnitude of the impulse of Y on X
E) the same as the magnitude of the impulse of Y on X