The rapid spin of this white dwarf, that is vampirically taking stellar matter away from a companion star, could be explained by its shrinking radius. While the white dwarf won't erupt in a supernova ...

the momentum after the collision is zero. In physics, this type of event is termed an explosion. Watch this video for a practical demonstration of conservation of momentum in explosions.

What is the velocity of the two carriages after the collision? Work out the total momentum before the event (before the collision). \(\text{p} = {\text{m}}\times{\text{v}}\) Momentum of carriage A ...