Sphere X, of mass 2 kg, is moving to the right at 10m/s. Sphere Y, of mass 4 kg, is moving to the left at 10m/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

E. the same as the magnitude of the impulse of Y on X

Explanation:

Impulse is product of force and time duration of action of force . When two objects collide , two equal forces emerge at the point of contact in opposite direction . Both remain active for a fraction of a second . Since these two forces are equal and act for same period of time , the pulse of these forces two are same .

so when X collides with Y , impulse on each of them are equal , no matter what their masses or velocities are.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it